Need good reasonably priced locksmith recommendation

All Star Locksmith on Flatbush Ave.

Installing a new lock on a door is something a child could do. You unscrew the old lock (it's two screws to get it out), and if you bought the same brand as a replacement that's all you need to do. The new one slips in and you put the two screws back.

If you bought a different brand, you have to remove the latch mechanism, which is two more screws.

The entire process should not take more than ten minutes if you've never done it before.

If you're talking about a mortise-type lock for an apartment building entry door, that's a little more complicated and you probably shouldn't attempt it yourself.