Mescaline, the hallucinogenic drug derived from peyote, is illegal in most countries, and as with all hallucinogenic drugs can be dangerous.
People have the tendency to have 'bad trips' if that is what they are expecting, the use of drugs in magick is a taboo topic and not one I believe has its place in this forum. I also personally believe anyone who relies on drugs to reach a trance state are taking a faster, dangerous route and not developing necessary skills.
I will say one thing, if you do wish to pursue any activity which has a possibility of harming you, you must have someone with you who is in perfect control and preferably learn from someone who knows what they are doing.
As for meditating that is easy, just focus on the breath for now, do this for five minutes at first, directing all your attention and awareness to it.
I won't say much on auras, as I believe there are a few methods, and it has been documented many times before on this site.