No, do not move unless you want your tat to look like a blurry photo.
As far as involuntary spasms, I never had any and the urge to move after the needle hits you goes away quickly as you realize you are not going to drop dead from pain. usually, and if the person applying the tat is good, they will touch you with the needle with black ink (the first to be applied) in a way as not to impair the design, as in on a line. If they are worth their salt, from then on you will have no problems.
DO NOT get a tattoo from just anyone! Do your homework. Just because someone has a shop that applies tattoos does not mean their tattoos are good.
Oh, I'd definitely do lots of research first, ask everyone I know with tats who did theirs so I'd know who to go to...and who NOT to go to! Thanks for the advice!
I have 5 at the monment. I've been doing tats for alittle over 5 years as a side job at local shop. I also have a full travaling tat kit set up with everything I need.
My friend has an inverted sternum also known as a "chest pit" For the longest time I have been begging him to get a tattoo of some monster coming out of it.... still not going for it though.... I thought it would be histerical...
I just got my first tat this year, to celebrate my 45th B-day! I LOVE it! It's a large, very colorful Dragonfly on my right leg, just above the ankle. I designed it. I don't have any photos of it to post here yet....but take it from me, it's awesome cool!!!