You should be alright, especially with your prior experience. And thats why you have the sitter as well, just make sure its someone you really truly trust because you may be in for one hell of an experience, at times it can be a bit surprising or frightening, and you will really need an experienced calm individual that can bring you down to a happier place if you reach a tough spot. I have only done the traditional route in the amazon so I dont have much to say on home ceremonies, except DO NOT UNDERESTIMATE the experience by any means.
The one thing that may or may not even happen is of course the purge, and if its anything like my experiences, your sitter or parents may be alarmed by the amount of vomiting hat could possibly take place. Its a totally natural and IMO a special part of the spiritual cleansing process, but it just may not seem that way from the outside viewer, so try to for warn them on that as best you can. Goodluck and safe travels

please let us know how it goes for you.