Do you have a Kuhnhausen book on the 45 yet?
He lays out changing sites in a very easy and straightforward manner, the whole job should take less than 20 minutes, I just added a staked on big bead front sight to a friends early Norinco and it took just about 20 minutes total. I made my own staking tool from a piece of 3/16 plate and I used a hack saw, a grinder and a torch to heat treat it about 20 years ago and it still works.