=)
I was just going to say pretty much what everyone else has said..
except I do know something about the colours, namely red. Colours are the colours they are because of what light they absorb/reflect. The colour red is red cause it absorbs every other colour but reflects off 'red' and something about the blue? wave length...but long story stort, red fades the quickest. My dad has a tattoo on his upper arm that was red yellow and blue, and now 30 years later is only yellow and blue, the red is completly gone.
in saying that...it has been 30 years.

if its something you believe in, and pull the meaning from, chances are you will get strength from that thing for life, and thus not regret it...obviously not the same for everyone.
One thing you can try is getting someone to draw (even getting the tattooist to use a transfer) of what you want where you want it, and test drive it for a week or so. as it will only be a transfer you can get rid of it or decide you want it in another place etc.
or you can love it and get it done!!!
good luck with it!! they are adictive =D