I went back to full time study when my daughter was 5 mths, so she was in daycare 5 days a week. I did feel guilty about it, especially when I missed things like the first time she rolled over. But I tried to look at it from a different perspective - that I was doing something that would improve our lives later on, as well as setting a good example for her.
Maya settled so quickly into daycare, and enjoyed it so much that after I finished my degree when she was 10 mths, I left her in daycare 3 dyas a week. She doesn't even cry when I leave her, in fact now she runs to the garage when I say "let's go to daycare". I think she thrives on the social contact there (I am a single mum, and she is the only child at home so it's pretty quiet at home).
I now work 40 hours a week, but I'm lucky that I'm able to work from home, so Maya has 20 hours a week in daycare, and I do the other 20 while she is asleep.
I would suggest that you check out daycares (if you haven't already) to find one that suits you and that you feel comfortable with. It's so much easier when you know your child is happy there, and you trust the daycare staff. I put Maya in daycare a week befoer I started study, so I had a week to settle her in.
Also, check out what your contract has about sick leave etc. in case bubs gets sick. Maya had 2 weeks in hospital when I was studying, which was totally unexpected and so I had to have time off.
Maybe you coul dease back into it by going part time, and see how you go, and if you think you could manage full time then go full time later on.
Good luck, and if I can help any more let me know.
Mum to Maya Grace 02-03, Sienna & Mercedes 10-06