Pro Acider here:
Jk but I have taken a decent amount of drugs and I'm no dummy so I figured I'd share my 2 cents on it...
Acid: Most likely you won't find legit acid in the US (even if it's a vial of liquid "acid"). Reason for that simply put is the chemicals to make it are illegal and/or incredibly hard to obtain. So someone buys an organic Chem book and uses it to cut corners and make a compound with a structure that's strikingly similar to LSD... we call these "Research Chems" or RC's for short.
You'll know it's an RC because your mouth goes numb where the tab rests. Also, you may feel like you're actually losing your mind when the trip comes on which isn't terribly common with tripping. Seriously. I remember almost punching a big dude in the face just to see if it was real life. I didn't, but for a split second I was so out of it I didn't know if I was dead or alive or if anything was real and in my head hurting someone else was a plausible way to test that.
Legit acid is very mellow, and if you aren't in the right setting it won't be a very fulfilling trip. RC's are like a roller coaster; once you're on, you're on the ride until the end.
The safest way to trip on acid is to buy 2 hits. Take half of one hit and if it's a chill trip then go from there and if it's heavy; well, now you got 3 more trips out of the 2 tabs.
Let the tab rest in your mouth between your lip and gums for as long as you can, and go watch the stars or something :P
Shrooms are fun, too: 1) make sure you ID them and do a spore test before you ingest them. A quick google search will explain that or I could. Honestly... don't ever eat a shroom until you know what it is.
2) Psilocybin Cubensis are most common in the US; they look like little bronze cocks with white shafts.
3) Don't eat more than an 8th (3.5g) unless you're freakin Andre the Giant. I've eaten an eighth of some shrooms which were more potent than I expected and I was nodding off and (I think) close to death. I am very thin, and tripping on shrooms is food poisoning. Seriously, 1.5-2g is plenty.
Best way to ingest (imo) : chop up finely, I've used a slap chop before and that worked wonders. Add the diced shrooms to about a mouthful or 2 of orange juice; toss it back in one gulp. You won't taste a thing and the OJ enhances the trip a bit
DMT is pretty intense ...
Don't try this until you've tripped. My recommendation is know what you're smoking; however you can. The time i did it I knew the chemist synthesizing it and I trusted him since I knew him so well. I haven't done it since because it was a bit much for me haha. BUT if you are gunna do it.... here's how I'd recommend it;
1) "Sandwich " it in a bowl of weed.
2) Get one or 2 BEST friends (or friends who would never judge you and who care about you)
3) Find a quiet, secluded place and take a few deep tokes, trying not to torch it. Don't drop the pipe when it hits. You won't be able to hold a conversation or talk at all really for about 7-15 minutes ... so make sure you're somewhere very secluded.
ALL IN ALL...
Before you trip make sure you plan it accordingly! It is a TRIP so plan it like a vacation. Make sure there won't be any reason for anyone to need your fully functioning brain for the next 10 hours or so after you ingest. I turn off my phone and put it in a different room usually, and make sure to plan out my events before hand since when you're tripping it can be hard to think of fun things to do.
Tripping can be fun! It's not something to do every day, and should always be done in moderation. RC's are bad news imo, I've had my fun with them and swore off them. I do firmly believe RC's can fuck up your brain. I think you should try everything at least once; except RC's... then I'd so no more than 3 times. Lol