If you still feel comfortable doing this yourself you might opt to only do the upper guides. At the relatively low mileage of 175K, the lower guides should still have a good 150-200K left in them. The upper guides are a piece of cake to do, once all the accessories are removed (Power stereing pump and backing plate, cruise actuator, alternator and bracket [plus I removed the distributor to access one pump backing plate bolt], as well as the fan and shroud).
Rolling in anew chain can be a bit dicey if you don't have the proper chain guide, but it can be done. Be sure to install a new tensioner when doing this job.
I recently did guides, chain and tensioner on the 560, took my time and had it done in a weekend.
If the car has a dual OHC, rather than the singles on a 560, I would definitely say "farm it out". DOHC are much more difficult and less forgiving.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.