I studied my second BA (would have to last 2 years as I already had a BA, I ended up spending 3 years) while working FT. My BA was by distance learning so this helped a lot. Basically I also planified carefully in advance (maybe at the beginning of each week) what would I be doing each day after work, allowing a minimum of 2 hours each day and 4-5 on Saturday and Sunday. Well, now it seems awful to think that this was my way of life for 3 years, but it wasn´t really that awful (I suppose that was because I loved my subject).
I guess not everybody who studies and works has such a schedule, I would love to be a bit more spontaneous but I felt that I need one in order to avoid procrastination.