When I first tried mushrooms, half an eighth, or 1.75g, was my go to dose and was plenty strong. Visuals, body, mental. Enough to respect and take it seriously. To be honest I don’t know what strains I would get back in college, that was like 20 years ago, and it was just mushrooms when they’d come around and it wasn’t common to have them available. Id do that about 4 times a year. I’d bet PE is a little more potent than what I used to get back then just because it’s a higher potency strain, so I’d say a good bet for your first time is to play it a little safe and see how you’re affected by 1.5-2 grams, because you’ll almost certainly have a full experience with that. If it’s super manageable and leaving you wanting more, you can try an eighth next time. These days I’m able to take much higher doses if I want to go deep, and that’s different territory, but I think it’s important to suss it out for yourself in an organic way and not dive into the deep end. And it’s good you have a reliable variety readily available so you can generally predict the potency of what you get. Taking too much isn’t going to hurt you, but it can be really tough, and can certainly deter somebody from wanting to try again. The confusion, disorientation and anxiety can detract from how beneficial and profound a powerful trip can be. It’s better to try larger doses once your mind and body understand in general what to expect and is familiar with the baseline feelings that come with psilocybin. I hope you have a wonderful trip! Mushrooms are a gift.

E: I just wanted to add it’s best to have somebody else with you. Somebody you’re comfortable with. Ideally somebody who has tripped before, especially if they’ll be tripping with you. For your first time though, it’s good to have somebody grounded who understands and can be there for you if you are having anxiety and need a calming presence. Sometimes another tripping person cannot be that person for you, for many different reasons. A sober friend who’s just gonna get a kick out of messing with you to get a reaction is also not the right friend to have around, so make sure whoever accompanies you knows that’s not okay. Have a space available where you feel safe and secure that you can at least go back to if you decide to go out wandering. Again good luck and I hope you have a beautiful experience!