Let your mum help grin and bare it if she is taking over, remember you wouln't see her for say 10 weeks after, so appreciate her while she is there. Let her get her way a bit, just chill and don't argue.
When she has gone, move it all around to how you want it.
Everyones parents helps them unpack a bit and all that.
In terms of my first day of uni...
I got to my halls and some guy showed me round and to my room while my mum parked, then I met up with my mum and we brought everything in (dont worry everyone, especially girls, have tons of stuff) as I was coming in I met a few of my housemates and we said hi, joked how we had so much stuff, commented on how nice the halls were, had the usual small talk where are you from convo but we were all so busy unpacking we didn't have proper conversations until later on.
Once our parents had gone we all went outside with some 2nd year girl, everyone from the hall was there. We talked a bit, but it was a little awkward. We then went to dinner all together and then to the bar in the evening to meet people.
I remember hearing hundreds of names, having the same conversation (name, course, where from, which block) with everyone and remembering absolutely no body...may as well not have been there but all part of it!
We then went back and went to bed feeling very confused and not really knowing if I'd like it, who I really got on with etc.
By the second night and a very drunken bar crawl things were a bit better. But still, freshers is definately very overrated. Its more feeling lost, unsure, desperate to make friends, desperate to settle and not yet feeling comfortable. By christmas I was fully settled, loving it, had friends and felt secure and happy. Just don't expect (even if you are the most confident and outgoing person) to be loving it right away, it varies but most people miss home and feel unsure about it all for a while.