Yes it is difficult even more so if you are at a high volume institution. The difficulty lies in triaging cases, learning how to gross while at the same time learning how to diagnose. Managing your time is very important. Don't hold onto cases. If you don't know a diagnosis, enter a diagnosis and signout with the attending.
It is important to ask for help if you don't know how to do something. You can make huge errors if you ASSume something. You have to learn things very quickly and yes, I know it's hard because there is so much to learn. Things will get better as you go on in residency as you will then know how to gross and diagnose without assistance and do things efficiently.
Life sucked for me as a first year. I learned by struggling and I am much more efficient now. Attendings will be upset because some will have little patience. If you screw something up big time, that is an easy way to get on anyone's sh*tlist. That's why its important to ask for help if you dont know. Also it helps if you have a good surgpath fellow or helpful senior residents. Some places the resident camaraderie is nonexistent, so that's why picking a program where you feel comfortable is important (for all those applying). I think as a first year, you have to make sure you gross your specimens correctly, do things on time and do whatever your attending tells you to do and you will be fine.
I've seen residents cry because they were so overwhelmed. So, you are not alone. I think I developed fibromyalgia from all the stress first year. I always thought to myself "Hey at least Im not in internal medicine or surgery." That made me feel a lot better. Plus, I got to sleep 6-7 hours a night.