If you got through the CPL IR bits and bobs ok then no probs. It's a hard course but the amount of cash, and i suspect +20k you will pay im sure that'll work as a motivation tool! At the end of the day; its a big Seneca!
However..... Pay for your own rating?! I understand how difficult it is to win a job.... I hope you have exhausted all your options before helping the airlines play with our T's and C's.
Good luck