Never messed with one on a 742 but I think it is the same trigger group as an 870 and is real easy. If it is the same, you'll need to get a RH safety and then swap it out. I would think plenty of people would swap you a RH for a LH safety if you want to get rid of it.
Yes, I have heard that it is the same trigger group. I think that I would like to keep the left, just in case. But, thanks I have seen a few on e-bay. Do I need just the one part or do a couple of parts make up the assembly?