Jon Weaver wrote in message
. ..
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!

I'd leave it alone if your filling and plastering is as bad as you say. This
stuff does *not* magically self-level, rather it is self smoothing. This
means that although it always sets to a smooth finish, you can get
undulations in the surface if it's laid badly. Also, you need to work fast
with it and, unlike cement mortar, you don't get a second bite of the cherry
if it's wrong. Don't would be my advice.