Lots of people (myself included) managed to complete the studying alongside a full-time job - it's hard work and requires discipline.
However, due to constraints with annual leave from my job, I did not go to Bristol since they split the exams into two modules each requiring two weeks (not including the exams). If time off work may be an issue, look at a distance learning provider who spilts the course into three modules.
Cheers
Whirls