@doglove with CIEP, chartered institute of proofreading and editing, formerly society for proofreaders and editors. (On phone in bed btw so please don't judge grammar and capitalisation in this post!) :)
Much more difficult than I thought tbh but I'm really glad it was because I feel more prepared for the reality of it.
The support is good, and the forums are excellent. It's not overly cheap, but in the scheme of things it's not a fortune either.
I've done proofreading 1, 2 and 3, and their theses and dissertation module. I've paid for books, pens and a website but that's my entire start up cost apart from training.
I've really enjoyed, but it's not for the faint hearted! My bauchi level of English is very good, so i was surprised at the difficulties I had, but there is so much to take in.
The only thing I would say is the time they say it will take to compete it's nowhere near reality. I think proofreading 3 was 25 hours, but that's only if you get everything bang on first time. With waiting for feedback which isn't quick, you're about 2 months.
If you'd like to know anything else please pm :)
Ciep.uk is the Web address.