Hi,
I don't understand why it must be sweat lodges. Here in Europe we have saunas. Saunas are mostly known from Finland and Russia, but they existed a long time before in other places too, there also been a excavation of a sauna like building in Great Britain:
http://www.dailymail.co.uk/sciencetech/article-3253643/Bronze-Age-sauna-discovered-Scottish-coast-Building-used-religious-ceremonies-4-000-years-ago.htmlFeel free to use a Sauna if your doctor checked up that you are healthy enough to do. Its more safe than self build sweat lodges, there had always been accidents and deaths in sweat lodges, build by frauds. In most saunas you can regulate the temperature in a safe way. Steam Bath is another option.
Dream Catchers?
There had also been something optical a little bit similar in South European history that everybody knows, Wind Chimes:
https://en.wikipedia.org/wiki/Tintinnabulum_(Ancient_Rome) But they had a different function and mythology.
In northern Europe it was believed, that bad dreams are caused by “Elves”(Alb, Nachtalb, Nachtmahr, Mär, Mara) which you could feel by being pushed into the bed, a cold, paralyzing feeling and optical vision of a black, heavy appearance. Some sources say that Artemisia vulgaris(Mugwort) was used to prevent it, however, placing your shoes in direction away from the bed should help too according to folklore, or this christianized charm:
https://en.wikipedia.org/wiki/Mare_(folklore)#Germany Other sources indicate the use of talismans(Amutlet) against nightmares/Nachtmahr.
If it is just for decoration and not because of nightmares, you can build your own Mobile/Wind Chime:
https://www.youtube.com/watch?v=g2OowpygkK4Upper world journey to meet Jesus?
My question for someone doing this is: Why? Why would someone need to do this? If you are believing in Jesus, a Christian Community and the Church are best places for practice. I,m not a christian, but I know that there was always dialogues in elementary school about a personal relationship to Jesus and the Lord, personal experiences and signs. So where I live, you can ask your local Pastor about questions of faith and personal experiences, if you are a member of the church. The Pastor is the spiritual authority, because he got a theological education and he can answer your questions and discuss the issue.
I´m not an expert in ethnology, but in my opinion this concepts of upper world middle world, underworld, nine worlds, and similar things, are not so easy to understand in the right historical context, so its more a personal belief, how you interpret them. Some educated people suggested, that places like Asgard had been not a mythological, but a geographical place somewhere in the black sea region ruled by specific tribe(s) and had become a myth by time after many generations of Proto-Indo-European people migrating to Europe. The concept of worlds nature, overlapped in ancient times in some places of the world, for example Buddhist, Hindu, Celtic, Germanic and Finnish cosmology. So this Concepts Harner tried to make a sense of, can only be understood in specific ethnic context. The whole Practice of Harner should be questioned.
When you seeking for trance experiences I personally would ask why, because is there a specific need for it, or is it just for interest, proofing personal belief, or even fancy adventures?
Next thing would be Harners concepts like power animals. Personally I don't know where I could relate to this idea anyway. So imagine a Wolf. What does a Wolf mean to you? To me it means not much, a animal in a zoo, something like an archaic dog, farmers hate it. I never was involved with wolves, they are not existent in the place I live. So every concept someone like me could have about a wolf is simply not what a wolf really is. I know nothing real about them, only from TV-Screen. So if someone would tell me, that a wolf is my power animal, it would be the same as saying cheetah is your power animal, or kangaroo. Absolute no connection in real life, so I think its just bullshit.
But I think it has to do with the majority of European way of thinking in general. Your parents gave you a name, this name mostly has an meaning, like Björn means Bear or Christian means follower of Christ. But who is selecting names in the sense of meaning today? Most parents think the name sounds cool, or somebody they liked also has this name so they name their kids this way.
The name has no meaning and no deeper intention, not even for the person itself and doesn't fit their personality and status in society, same as Harners power animals. Plastic animals for plastic shamans.
Hope it helps