Upcoming Trip, slightly worried

[Tevryr]

So SWIM has only tried LSD once (1 tab, no serious hallucinations but lasted over 12 hours) and two of his friends decided to have a trip session with 3-4 hits each. This will be happening in SWIM's backyard at night with a nice bonfire.

However, SWIM is slightly worried but very anxious for this to happen. First of all, SWIM has a low-low tolerance for everything drug-related. In fact, SWIM can barely get high from Cannabis without turning into a zombie. Second, SWIM lives with his parents, who could come down at night (though unlikely).

Basically, SWIM would appreciate advice on how to make the situation more favorable, and if 4 hits would keep hallucinations and general "acting like a good" the full duration. Also, how would Tramadol effect the experience?