I had SPD with my last 3 pregnancies (still have it, infact, the ailment that keeps on giving 
) Anyway:
DC2: SPD from 30+ weeks. Home birth, kneeling, no pain relief. Stood up for a bit, but much more comfortable kneeling with knees fixed at shoulder width apart and elbows on a low bed. I could not, would not get on the bed and do a stranded beetle.
DC3: On crutches by 23 weeks. Home water birth in just under 4 hours, no pain relief (or stitches) despite baby coming out with hand by head. The water was a relief, because I could shift around during labour without needing 50 billion pillows or a hoist, although I ended up in pretty much the same kneeling position.
DC4: Wheelchair & crutches, although not quite as bad as DC3 because I did nothing My expectations of pg were very low and although I was looking after 3 kids under 5.5, I took every shortcut and got as much help as possible. First 4 hours of labour were very progressive, again at home in the pool. Then it all went a bit pear shaped: I was pushing in a kneeling position (again 
) and there was a thunk and OMG it hurt I was convinced my hips were going to dislocate, I was screaming. With hindsight, what had happened was DC4 had descended with his head on one side as my pelvis was so loose and was then forcing my pelvis apart as he came down s l o w l y.
At this point, I was so very very glad I was at home with an IM. She had asked a colleague to attend, who was very keen that I do lunges, go up the stairs sideways: do all sorts of things to "open up" which was the last thing I needed/wanted or could do. Because I was in my own home and my midwife was backing me, it was very easy to say no. It took me almost an hour to move from kneeling to standing, another hour or so to get onto the sofa: I cannot express to you how much it hurt 
Then I finally gave birth in left lateral after another 90 minutes with the IM eventually "chinning" DC4 out i.e. her thumb under his chin, the 'original forceps' I think she said. I should point out that at no point was DC4 in any distress, his heartbeat was consistently fine.
If I'd been in hospital I think I would have ended up with a CS for failure to progress. If I'd had a less experienced MW, or a MW who had not supported me through two pregnancies and seen my limitations, I probably would have ended up with an even longer recovery as I would have been "encouraged" to bugger my pelvis up even more to try and speed things along. I'm glad I didn't have a CS, partly because of the other DC but mostly because I know what a difference having good stomach muscles makes to my SPD and cutting through them and having to recover from that, would take me even longer to get back to normal.
Apologies for the long post. I guess it demonstrates that SPD can make for a quick and easy labour like my DC2 & 3, or a hellish one like my DC4. I hope it works out for you.