Give me a shout when you're doing it and I'll come over if I'm free. I don't have any spring compressors either I'm afraid, but have an ask around mates/family members, they're a prime thing that people buy, use once and then leave on a shelf for 20 years.
I've done springs on both my Celicas (and helped Mek with his fronts) and speaking from experience, you stand more chance doing the backs without compressors than the fronts as I recall, but I wouldn't fancy trying it without them. What year is your car by the way? When I did my T-Sport it was a breeze cos she was 2004 with about 35,000 miles on her, but when we did Gareths 2001 there was way more rust and grime, which really made things more difficult! Might wanna invest in some rust penetrating spray is why I bring that one up. Drop me a PM if you need me anyways