Don't panic! Hysterectomy veteran here - mine was over 5 years ago, abdominal hysterectomy and bilateral oophorectomy. I had fibroids, adenomyosis and endometriosis.
I’m worried about waking up after the operation in pain, stapled up and feeling like a beetle stuck on it’s back!
You'll be on painkillers, so the pain should be manageable and you can ask for more pain relief. You should be able to sit up in bed - they'll raise the bed for you if you want. You'll have a catheter in so no need to worry about getting up in a hurry for a wee.
How the heck do you put your knickers on afterwards?!
Big, soft, comfy knickers are fine. You'll need to wear a sanitary towel at first because you'll bleed from the operation - nowhere near as heavy as a period, though.
How easy is it to get in and out of bed?! Is it as painful as I’m imagining it to be?! Will I be able to get up and out of a chair ok?!
Going from lying to sitting to standing is probably the hardest bit. You have to take it very slowly, easing yourself off the bed and trying different angles to get your legs on the ground. It is painful but not unbearable and again, you should be given a supply of good painkillers. Once you are on your feet (or in a chair) it's fine, but the pain on getting up is the last pain to go.
Prepare a recovery nest for yourself at home - everything in easy reach, pillows and so on so you can prop yourself in a comfortable position. If you don't have anyone to cook for you, prep some meals (or buy ready meals) that are just shove-in-the-oven things to tide you over for the first couple of weeks.
You'll find you gradually potter about the house more and more as time goes on, you shouldn't force yourself to do more than you feel comfortable with. The tiredness is worse than the pain after the first few days - it's overwhelming exhaustion as your body heals, so you need to let yourself sleep as much as you need to.
Everyone's recovery is different. It took me 7 weeks to get back to work (desk job) but after the first week it was quite pleasant to lie around doing not very much at all.
The operation was the best decision I ever made. You won't regret it if you're in pain because once you have healed, that's you free of pain forever and also free of periods and the hassle of erratic menopausal menstruation.