Phew - first day back at work over with! I do contract work and left my job when I had DD a year ago. Today I started a new role (3 months initially) with DD at nursery full time.
I have followed most of the advice in Scottishmummys post - have driven the route a couple of times before starting and am really glad I did as it's a bloody awkward drive. Not terribly far in miles but slow A/B roads and have to cross a city too, plus doing nursery drop off in opposite direction!
Have eaten a home-cooked meal out of the freezer - DP works away so I bagged up everything into single portions. All my work clothes are hanging up on a temporary clothes rail so that I can make selections easily. One thing that shocked me was how few clothes I had that fitted properly and didn't look bobbly/well-worn etc. DD's clothes are in about 8 bundles in her wardrobe, all set for the week too.
I feel like the only way I've survived is constant lists - what time to get up, what to pack, when to leave house etc. There is absolutely no margin for error re getting to work on time after nursery drop-off. DP did the drop-off this morning but I forgot to warn him DD gets clingy but then is fine. His last memory is of her grabbing him and crying. She was fine a couple of minutes later but he cried all 100 miles to work 
I left work a bit early to get to nursery pick-up in time, but took a different route to save time and it was congested so ended up 15 mins late. Burst into tears when I arrived there as felt so bad for DD (who was fine).
So, survived first day in new job, looked reasonably competent, and just hope it gets easier each day. Right now, I feel like my life is being devoted to this job!
Well done on getting your new job Ruby - agree it's very nice earning money again. I'm sure you'll be back in the swing of things very soon - once I was sat at a desk today, that year away from an office environment just disappeared.