So DD is now a little over 2 months old and since she was about 5 weeks bed time has been a nightmare. She screams for nearly 2 hours every night, originally her bed time was between 10-11 and I would start getting her ready (i.e. bath/change into pjs, eat etc.) around 8:30 or 9. However, I thought maybe she's staying up to late so I bumped everything up a couple of hours and still the same fussiness, it's like she fights so hard sleeping now and there is nothing I can do for her

. Ughh, I'm so frustrated with this, please tell me it will get better and one day she won't scream for 2 hours straight
Re: Getting DD to sleep=nightmare :(
Babies sometimes "wake up" when they are around a month old, even if they've previously been kind of sleepy. It's also normal for them to become very fussy in the evenings for awhile. My oldest was never a good sleeper & was fussy whenever she was awake- which was about every 2-2.5 hrs to eat until she was over 6mos old. My second was a lot easier, but she went through a period of time from around 4-12 weeks where it took a good 2-3 hours every evening of comforting, nursing, etc.
I think you're doing the right things by getting a good bedtime routine in place, trying to adjust bedtime, etc. Some of it just comes with their age/maturity. It is exhausting, but some babies just need more time to adjust to the outside world. Whatever you do, don't CIO at this age- she is way too young.