I have skim read most pages, am interested as I am due to go back to work soon!
I went back to work part time when DS1 was 8 months old. As we were preparing for me to go back, we looked at childcare. I had this weird idea in my head that I didn't want to use a childminder, until I started visiting nurseries. There are three in our immediate vicinity and we both hated them all. I literally felt I could not leave DS1 there. (I am not criticising nurseries per se, btw, just these ones!!)
I started panicking and thinking that I would not be able to return to work - and we would have been living on a shoestring. I then started looking at childminders, found a lovely one, and immediately felt very different - seeing DS1 crawling round on the kitchen floor, being part of a family, made so much difference. 4 years later, he has just returned there after my second maternity leave, and is so happy he doesn't want to leave at the end of the day! Ds2 has settled quickly too. "Childcare" is a very broad term and finding the right type can make a massive difference.
Also, I completely understand how wrenching it is to leave your small baby, but I assure you it is MUCH harder to have to say you can't attend a school event, or that you won't be taking them to certain after-school clubs, activities, you won't be there for tea that day etc - I think many people think it will be so much easier to leave an older child but it isn't, and if they are used to a structure where you work, and they are settled and happy with carers, it makes things much easier, rather than having had you constantly available, and then adding you returning to work to them starting school, starting childcare and so on. Also, if you have been working for longer, it is easier to get work to be flexible so that you can be there for school plays, sports days, and all the millions of other events that you will feel massively guilty if you don't attend...!
For us, my working is the only way we can hope to save up enough to move on from our tiny HA flat, so we are very much thinking long term too.
Good luck with your decision