Don't take this the wrong way.
Picking locks is less than 10% of a general locksmiths work, unless you're doing warrants or specifically targeting lockouts only (in which case your business wont last long).
A good business plan, around Â£15-20K investment (for the first year) and not expecting a living wage for at least 3 years is a start for being a locksmith in the UK.
And you still have to be lucky.
You may struggle, especially if you have to ask on a hobby site for advice.
It's all about the tension . . .