Hi Luke
One thing I would like to add is, in my experience you have to become a musical prostitute for the money !
I've played in wedding & function bands for the last 7 years, 2 nights a week every week. The band all earn good money from this, but you can't (IMHO) just get up and play what you want to play, or play your own songs. Sure you chuck in some songs you like, but Joe Public wants to hear the Brown Eyed Girl, Girls Aloud and Abba medley's especially at weddings where the bulk of the work lies.
So, choice is usually to sell your soul and earn the cash or, if you still want to make it doing originals then expect to be skint.
As 5 piece earn £800+ but play 8-12 with a 30 min break.
That's 3 1/2 playing time, and we'll have a go at covers (even first time) or back singers if the need arises. You get used to it, and again IMHO it makes you a better musician, and tighter band because of it.
S