Hi. Sounds like you know what you are doing and working from home should make things a lot easier to manage. I would definitely say I find a day at work is easier than a day running round after toddler twins. I get to sit down and drink a hot cup of coffee for a start!
I went back to work about 7 months ago when my twin girls were a year old. I work 3 days. They go to nursery 2 days and my parents in law one day. My husband usually works from home on their nursery days so picks up/drops off. I have flexitime which helps when I have do to this, otherwise I think it would be quite stressful getting us all out of the house in the morning and making sure one of us was back in time to get them, but I guess you just have to be super organised.
Took a few weeks to settle in but they absolutely love nursery now. I can't be sure whether it has helped their development, but I think the nursery environment has really helped them to start to learn boundaries because they have to fit in with the routine there. They get more variety of food and activities than I would manage just at home, especially messy play and crafts and stuff. I love it when they come home having learnt a new word or the actions to a song or something, but I know some mums struggle with feeling like they are missing out on stuff like this.
I was getting cabin fever by about 10 months. Much as I love them, it was so intense being with them 24/7. I was starting to wake up just wishing the day away until bedtime, especially if we didn't have a group or anything planned that day. Once you are in that mindset it's a vicious circle of you and them getting more and more fed up. Had a knock on effect on my relationship too as started to resent my OH when he talked about his day at work and I felt I had nothing interesting to say about my day. Now I look forward to my days at home with them, and we can happily spend a day just pottering and playing at home. Everyone's much happier now.
I'm enjoying being back at work and using my brain again, but I find working part time a bit hard sometimes. I often feel frustrated at myself that I'm not doing as "good" a job as I used to, but I think maybe I just try and do the full time amount of work still. I'm having to learn to compromise on certain things and let go of control a little bit as things do carry on for everyone else on your days off.
Be prepared to have to take quite a lot of time off in the first couple of months as they pick up a lot of bugs at nursery. The really tough bit though is when they are ill/teething or otherwise not sleeping and you are busy at work. I've had one of those weeks this week. Having a well deserved glass of wine!