If you've never CLA'd a Compur shutter before I suggest you either practice on a less important one or let someone with a bit of experience do it. It does require complete disassembly of the shutter and uses a few micro tools you may not have if you don't regularly work on cameras.

If you do decide to work on it yourself, make sure to take plenty of photos so you have a record of where every screw and spring go and in what orientation.