I have a SAA in 38 special with a 7.5 inch barrel which I need to replace. Won't go into why. I've found a 5.5 inch on GB and thought I would put that on until when or if I find a suitable 7.5. They are both 2nd gen. Are there any problems with this or is it just unscrewing one and screwing the other in? Would it be better to have a smith do it? I'm fairly handy but know better than to experiment with something this expensive. I'm going to check out youtube for a video, just haven't done it yet. All suggestions appreciated.