By the time I had 300 hours, I had 'type ratings' (and instrument ratings) on two versions of the Jet Provost, the Hawk, The Hunter, the Jeststream and the C130 Hercules. I also had some experience in the Lightning. The difficulty of a type rating is not so much related to your flying hours as to the quality of your training to date and the amount of work you are prepared to put into your training.
Don't worry about your hours. If you've decided to pay for and work towards a type rating, give it all the effort you can. That's the crucial factor.
Scroggs