I'd pretty much echo what FFF has said. It is certainly "do-able", but be prepared from the outset to commit the vast majority of your time to it and not much else.
Took me about 13 months with BGS (with F/T job, like many others), mainly studying between 2 to 4 hours every night after work, but generally took weekends off. Obviously you do have to have the odd night off otherwise you will end up going stir crazy.
As already said, do not expect too much of a social life/TV/beers (tragic I know) for that year, but it is only a year, worth it in the end.
The flying training after the studying is excellent though, and although demanding, very, very enjoyable.
All the best with it.