I'm going to skip all the what's easier on whom blah blah blah.
However, I had my tubes tied right after my 3rd vaginal birth ... I was 31 also. But I knew 100% for sure that *I* NEVER EVER EVER wanted to be pregnant EVER EVER EVER EVER EVER EVER EVER again. Hubby didn't care one way or the other. And I'd have had it done even if he objected LOL I was DONE with pregnancy.
As for how things went ... I had my youngest on a friday at 5pm, on Saturday at 9am I was down in the OR getting prepped. They did a spinal on me (and gave me groovy drugs so I was uber relaxed and chill listening to music while they did it), tied me up and poof that was it. I only needed one dose of percocet later that day. After that I was ok with just some tylenol for tenderness. Monday at around noon I went home.
For me it didn't interfere with caring for my older two (ages 5 and 3 at the time) or the new baby. I wasn't any more worn out than any mom with 3 young kids. I wasn't in a lot of pain. In fact I want to say I was pretty much pain free in less than a week (might have been slightly longer tho ... it's been 15 1/2 years so my memory might be a little foggy LOL).
Honestly though ... you and hubby need to sit down together and have a complete and full discussion of this. Discuss fully all the issues surrounding each procedure. Also if one of you is more opposed to the procedure than the other. Leave out the whole MIL stuff. And realize men are naturally and instinctively VERY VERY VERY protective of their junk LOL
Hope all goes well. If you have any questions feel free to message me.