I'd rather sit next to at dinner a pyramid scheme seller, a Jehovah's Witness and an estate agent than a H&S dullard.
Don't do it, it will consume your being. When I had to do a H&S course I spent the entire time looking at the items on my desk and thinking of ways I could incapacitate myself with them but not cause any permanent injury.
What can you already do? Generally, not specifically as you are looking to change career. Do you want a complete change, or do you just want to do something similar to what you do now but with new scenery?