I have no idea what I took or how much.
All of my other trips have been after adopting a stance of radical acceptance and abandoning most of my preferences. Allowing myself to do what I want I think is really key to living fully and helps dramatically with tripping. If you're nervous about your first time, maybe find a trip sitter. There are also integration coaches out there who can help you prepare and followup with practices for integrating what you learn.
Ultimately, if you setup your environment to have all your needs accounted for (which may include putting "flight instructions" nearby and easily visible, taking a big dose and laying down with an eye mask on in a quiet environment can take you very far. You can always open your eyes and remind yourself you're safe, this is the mushrooms showing you what you need, and it shall pass. Don't Gandalf the Balrog, look at it and ask "What are you doing in my head and what do you have to teach me?"
I know people who have had very scary trips and came out having learned very little and changed very little. They also practice deep denials of reality, so I'd check myself for cognitive distortions and work them out or at least get into the habit of pausing and questioning an experience before flying solo.
Are you making music as part of your therapy? I ask because I've found making music allows me to see how I'm applying my brain to things. I practice playing what Sun Ra calls "pure jazz," music without preconceived notion or simply just being. There's no wrong note or wrong time to play it. However you want to be programming your brain to work, if you approach making music from that mindset, it's a safe environment to practice it.
I hope this helps you in your healing journey <3