I had a lot of soreness the first few weeks. At times it was toe curlingly, teeth clenchingly, eye wateringly painful and I really had to push through it. Cracked raw skin, open wounds, horrendous let down pains, the lot. What helped for me:
Lansinoh every single time. Don't skip it even once. If you can't bear to apply it to the nipple, a dollop on a breast pad and gently press onto nipple.
Air drying, and no soap. I just rinsed when I did get chance for a shower, and wrapped my towel around my waist, letting my nipples air dry. Give them plenty of air generally too.
Nipple shields. When it got really bad they gave some relief.
Paracetamol. You can have it, take it. It does help.
Letting myself focus on that alone. I was in pjs for 6 weeks, and all.i did was cuddle and feed and change nappies and nap. I set up snack stations everywhere I was likely to be sitting, and accepted that for a while, I wasn't doing much else. I allowed myself to focus on it, if that makes sense?
We also checked for tongue tie, and tried different feeding positions. Rugby ball hold worked best for me.
Tbh even with that it was still the hardest thing I've ever done. And when ds was in the middle of an epic cluster feed, my dh did give him a bottle of formula to let me get some sleep, because i was sobbing with pain and exhaustion. Ds was fine, I cried for several hours then obtained a grip, and agreed it was the right thing to do for all of us. From then on he got the odd bottle of formula mixed with expressed milk, and hes been absolutely fine with that. I got a break occasionally, my mum got to have him overnight a couple of times, and it was all around easier because he basically didn't care where it was coming from as long as he got fed. (He's one now and still like that, he eats like a champion!)
But after about 6 weeks it got a huge amount easier. Everything healed and the pain stopped, almost overnight. I fed until Ds was about 8 months though and weaned off after I went back to work, and my gosh I miss it now. Looking back it is one of my most joyful memories of his babyhood.