Is it best to let someone take a look at it, or attempt to replace it myself? Just want an opinion as I'm pretty sure I have a burnt exhaust valve. Don't want to waste my time.

Take it to a shop.

Thanks mate.

Why do you think you need to replace an exhaust valve?
To be honest unless you have experience with working on cars it'd be a big job to tackle + you'd need to get some machining etc done anyway I assume

Is it best to let someone take a look at it, or attempt to replace it myself? Just want an opinion as I'm pretty sure I have a burnt exhaust valve. Don't want to waste my time.

Easy job to do yourself. But only if you know what you are doing.

My cousins boyfriend is a mechanic, so I'll let him deal with this one I think.