Hits are on average weak these days, and although I started off with 1 hit on 2 occasions, these were by far my worst experiences with LSD. I didn't freak out or anything but I was definately a little anxious because, if you don't dose high enough, you may be caught in between sober and tripping, which is a shitty place to be. This is what happened to me, and I got absolutely nothing out of those experiences, and they almost turned me off of LSD. I didn't use it again for years.
I recently dropped 2 tabs and broke through into a whole other world, it was life changing and overall incredibly positive. In fact, it was so awesome that I dropped 5 tabs a week later, which was the most intense experience of my life, but still very very fun. LSD will put your mind in a very compassionate place which can be a catalyst for coming to terms with life issues. It is not an escape so you will definately be confronting your fears about the car crash and stuff. If you are cool about being honest with yourself, and you are in a great mood the day you want to take it, I really see no reason not to drop. Another thing is that your imagination can come to life, your memories can feel just as real as what you are experiencing around you. Just be ready to accept anything, put the car crash and stuff behind you, because that's in the past it doesn't matter right? You are here today and you are alive and you can be anything you want to be - LSD us not going to hurt you from this perspective.
My advice would be to start with 1 hit, wait a few hours, and if you arn't getting much out of the experience or feeling a little anxious, honestly I would drop a 2nd tab. Once you break through into the LSD world, you will know. Don't fight it, just go with it, and I really think that if you are in a positive state of mind, and positive place in space and time, you will be having such a great, mind-expanding time you will be beyond the thought of a bad trip. Oh ya, and it is physically stimulating, moreso than MDMA, so really, you might be pleasantly surprised by the euphoria you encounter. Another thing - fuck the Valium man, once you are high, you'll probably just laugh at how you even had that little thing. You'll think, what even is that shit haha? Pharmaceuticals are the fucking devil. Just don't be nervous!
And it is my opinion that anyone using MDMA on a regular basis should really switch over to LSD at least some of the time. It is far, far easier on the mind, and there is no down whatsoever - you will probably feel wonderful afterwards, possibly for weeks/months/eternity). And I thought MDMA was everything before I tried acid, but for me, acid blew MDMA (and ever other drug I have every tried - it really is next level shit) out of the water. And to be honest, I really have no idea how any intelligent person with a strong mind, strong body, and a love for physically stimulating, powerfully consciousness-altering drugs could ever have a bad trip on LSD. If you meet these criteria, and you know that deep down inside - regardless of any problems you have encountered along your path - that you are a good person, I say drop that fucking acid, I guarantee you won't regret it!