Are new valve locks necessary

Guys,
I broke my cam in with the stock springs and now i think its time to install my Comp 901's. Any advice would be great. My method is to borrow the valve spring puller and compression tester from oreillys, add air to the cylinder. I will also bring the cylinder I am working on to TDC in case the valve falls. I already have the springs. I was looking at buying the right retainers and valve seals. Do you guys think its necessary to buy new valve locks. The stock ones are 7 degrees and that's what the comp 604-16 calls for. Are locks a typical wear item. I don't want to buy them if not necessary. Thanks