Same as mate, lower back went in me 7 years ago...couldn't walk for a month, pee everywhere I'm telling you... bloody horrible.
But..what I do is start early, plenty of coffee at hand and basically become part of the car lol lean,lay whatever it be I get comfortable and surprisingly there is alot of space to lean on.
Took me ages to do the n249,sai,pcv,aircon spread over time, worst part is having it in bits and feeling the pain come in...no matter what it's going to be put back together that day so pain or not. Horrible but worthwhile saving labor charges.
Come to Peterborough for the day sometime, we can both look done in outside mine and get this stuff off.
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