Yes, I gave up my job to study the access course full time - I had just finished maternity leave and didn't see any point in going back, and I thought 'sod it -we'll cope'. But it was very tough. Some access courses can be studied in the evenings or over two years, but I was 33 and didn't want to leave it any longer to get to uni.
Not sure about your placements, but yes you may well need to sort out childcare for that. Ours run in term-time, and in a block of 4 weeks then 2x12 weeks, but yours may be different - yours may be more like nursing where they do placements continually throughout the year. You'd have to check with the uni about that.
It is so nice when you finally feel motivated and know what you actually want to do with your life. It's annoying for me that it took so long to get there though. And admittedly I'm beginning to flag a bit, lost my enthusiasm slightly, but alot of us feel like that in this third year - just cos it's a bit overwhelming with so much to do and learn!!