I've only tried it twice at lowish doses, at that level it was similar to shrooms but lasted longer and a different body load, I'd expect there'd be more noticeable differences at a higher dose

That was synthetic mescaline, taking Peyote or San Pedro would be quite different

If you can get your hands on it, as with anything id suggest dabbling in low and moderate doses before going for a mind melt, follow best harm reduction practices

If you're asking if I'd recommend it for a psych noob, I'd actually recommend shrooms more as a 50 liberty cap/1g p. cube trip is a good introduction on what to expect for psychedelics without being overwhelming

A low dose mescaline trip could possibly be good for a noob, the only thing I'd watch out for is since its quite a rare drug(in places where it isn't in local flora at least) purity and thus dosage can vary a bit( erowid and such as good dosage info but purity can move that around some what) like I said I don't have experience with the cacti but I think it would be possible to measure by weight, but going for a traditional native or the pseudo version of such from what I've read there recipes are intended to be strong

Assuming you can get it in person then you'll probably have people you can talk to regarding dosage and such (although don't take anecdotes as gospel, people who can take heroic dosages can overestimate how much less experienced people will need)

If you're getting it from a DNM, and your goal is just to trip if you haven't before, then I'd go with something more common like acid or shrooms