I have just had my conservatory floor screeded, and to be fair they
did a good job.

But I was always intending on laying Self Leveling Compound before my
floor tiles.

However, I would say that the screed is slightly lower than I hoped
(perhaps 5-10mm below the DPC), so Self Leveler would not only level
the floor, but would give me the extra few mm that I am looking for.

However, having never done anything like this before, I am not sure
what to expect.

My attempts at filling and plastering have been monumentally bad, but
I am hoping that as the compound will 'self level' it won't be too
hard.

Is there anything that I should (or shouldn't) do?

Any hints or tips would be hugely appreciated.. I would hate to do it
wrong and spoil everything which has been done so far!