How do you feel about committing yourself to another three years of exams?
The professional examinations that you will almost certainly be required to take as part of your training are not always difficult in themselves, but do require determination and focus- especially as much of your study will be done in the evenings after a hard days work.
You should also be aware of the range of qualifications open to you - many of the large clearing banks offer the opportunity to gain qualifications in marketing, personnel or accountancy - not just banking.