With DS I went back to work FT when he was 3 months old, with DD she was a bit older but by the end of my work-expressing time I came to realise:
A double electric pump is definately worth it. I had an Avent IQ Duo - it cost about £150 but I got a special offer and I sold it on ebay afterwards.
An expressing bra is really really handy. It meant I could read a book (I tended to read parenting books while expressing), have a drink, have a sandwich, so the expressing time was also a break.
Having a little permanent expressing place is great. I used the attic at work where I could leave the pump, a blanket to cover me if it was chilly, photo of baby, etc. Saves time rather than having to pack and unpack it all.
If you ask and explain, people really will help. I was away at an event and had to get the hotel to freeze EBM in their kitchen freezers - they were fine with it.
I started with 3 sessions a day, which went down to 2 as they grew. By around 11-13 months they didn't need any more EBM during the day.
The nursery manager was HUGELY supportive of me and this made life a lot easier - I would provide small bottles so they could give one, two or three depending on appetite. My DS is getting ready to leave nursery soon and his key worker was talking the other day about her memories of feeding him his little bottles of milk, they really seemed to value that I was expressing and that the milk was not easily come by!
Good luck and be proud of yourself.