[Closed] Fitting a new groupset - advice, please?

So… on a whim, I decided I deserve a bike which changes gear when I want to rather than whenever it feels like it, and which will stop quickly and reliably. So I have a new 2*10 Deore groupset to put on my 2006ish Inbred 456. It currently has a bodged mixture of SLX shifters, Deore and X-7 mechs, Middleburn cogs, Truvativ BB and the original BB7 brakes.

Any STW wisdom to help make this a pain-free adventure, please? I have done all of the jobs in isolation before now, but never the whole thing in one go. I am not the world’s most gifted mechanic, and would quite like to get this right.

Thanks.