I just hit 10 months in the ER as a new grad and had a 12 week preceptorship. I'm far from a seasoned nurse, but I'm not the same RN I was last November.
Those first few weeks/months should feel like a slow motion train wreck, at times. Don't jeopardize patient safety or your safety at any time.
When the tasks started piling up, sometimes I had to "slow down to speed up". Meaning that in order to tackle a mountain of tasks, I needed a quiet moment in the med room to develop a plan of attack. I found that if I slowed down a (tiny) bit, made sure to get the supplies I needed in one trip, was prepared for whatever I was doing, this makes things go so much easier and less stressful. You will be slow getting things together and setting them up but with repetition comes efficiency.
Lots of people on these threads have said that with exposure and experience comes confidence and comfort and at this point I agree. Something clicked around six or seven months for me and every month or so other things click, or at least I notice things fall into place with what feels like less effort or stress. Lots of things happen in what feels almost like automatic mode now.
Until then, you gotta stick out the tough shifts, the terrible patients, the (hopefully occasional) degrading comment and keep asking questions and taking notes and looking things up. Figure out who your pillars are on your shifts, lean on them (but not too much) and learn from them. You'll get it.