I agree, lasers can be cool and maybe useful under the right situations, but they will never replace good understanding and use of iron sights. The Crimson Trace revolver grips seem to be the best of the bunch though, so i will be interested to see how you do with them long term. I would strongly suggest taking the batteries out, shooting the gun a couple hundred rounds to get used to the iron sights, then put the batteries back in and start working with the laser.
I would also suggest that you practice using the laser from an 'aimed' position i.e looking over the top of the gun at the dot. This should help to burn some muscle memory in to help with your shootoing and keep you in roughly the same shootin stance with the laser or the iron sights.