He is right (not quite in the fashion shown) but if you use a tad of caution you don't need one.
If you have an impact gun it is alot easier.
If you still want to use a compressor you can likely rent one from Canadian Tire.
Also check out redpepperracing.com, they have a teck manual for our cars, that should help you out.
I've never heard of "Part Source" since I'm in Quebec(Montreal). But I'll definately borrow from Canadian Tire when I need the spring compressor in about a month.
I'm planning to sell my 95 RS soon, and I'm thinking of putting the stock springs back on before I sell it. (right now I have KYB GR-2 and Suspension Tech. lowering springs, but the ride is so harsh due to the springs. I had them on for 2-1/2 yrs though).