I've installed a bunch of cams. Overall there's nothing hard about it. You loosen bolts and take a piece off here and there, pull out the cam, slide the new one in, and put pieces/bolts back together. As far as motors go, ours are very simple and easy. This makes working on/learning about them pretty fun and enjoyable.

The bolts you would like on that balancer are M6 x 1.00 x ~75mm. You can use 1/4" fine pitch bolts if you can't get the M6's. The M6 is tough to find in that length.