It's doable as posters have said. I'm doing my ATPLs with CATS (pm me for more info on them if you wish) and working full time, albeit shiftwork.
It's a lot of work and everyone has aptitudes in different areas.
BGS are IMHO the industry leaders, but are quite expensive. You get what you pay for.
Other providers include; London Met Uni, Cabair, Oxford, Ground Training Services. Each may divide modules differently - pick the one which suits.