I agree with Peter -

You can roll in a new chain without special tools. I did it by myself. I rented a chain link crimper but I've heard form known authorities (Larry?) that you can take a hammer and anvil and peen the clain link pins by hand.

I [think I] disagree with Peter -

I don't recall using any special tools to R&R the 603 IP. At most I had the locking tool to keep the IP center shaft from shifting from the static timing position but the center shaft is so difficult to turn by hand that it shouldn't turn on it's own during R&R. It's a long tedious job to R&R the IP and you need special tools to properly set IP timing. Static timing gets you only so close.

Sixto
95 S420
87 300SDL