I'm speaking within the framework of what is sensible, given the science. If you want the trip to have more lasting effect then according to the research you should have someone guiding you along. It kinda makes sense too. You can spend a trip looking at butterflies and admiring them taking with you from the experience a certain wonder for the beauty of nature. It might even help you with your depression somewhat but will not substitute professional guidance that will help you confront what is an underlying psychological issue actually causing the depression.

I think the point was that a sitter doesn't need to do it professionaly. A trusted, sober guide with some experience will work as well.

Could you provide a link to the protocol or framework that you mentioned? I’m considering trying Psylocybin and would like to get informed beforehand.

Update: A downvoted post asked how to find that protocol or framework. I’d advise looking at MAPS’ site at http://maps.org/ - there are manuals and protocols there - as well as tracking back to the source studies that the FDA is basing its decisions on and searching on Google Scholar for papers.