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It's health and safety, there's no problem taking the cover off if you have a bit of training and some tools. No one is going to encourage you to do it, especially not some random on the internet!
If I had the time I could describe a few ways that the process can go wrong but there are quite a few checks you should be making after the work which it sounds like you are not equipped for.
If you have any exterior fittings on your installation I would disconnect those. Switching off the breaker doesn't necessarily solve the problem of a line/neutral fault which is what the RCD is supposed to pick up because of the way the neutrals are joined in some cases.
Airhead
Thanks, my builder basically said don't touch it. I agree it makes sense to get someone to look at it, it seems a bit ridiculous that the 'fuses' (I know they're not actually fuses) in modern consumer units aren't actually consumer replaceable. What an ironic moniker.