With the next lot of grouting coming up, I have a few questions that I
have not really seen dealt with before - it's just assumed you have
the knowledge :-

When mixing powder grout, what consistency should it be ? - I think I
made it too running last time,
and it formed small bubbles etc.

How much grout would you expect to be left on the tile surface after
using the grout float ? I didn't leave the grout long enough before
trying to sponge it last time, because a film of grout on the surface
was starting to set rather too much. Sponging too early caused some
unevenness in the finished grout lines - not that hard flat look.

How hard should the grout be before you wipe it / sponge it ?

The grout shaping with a stick is not what the professionals I have
seen do. When just using the float, should you just push the float
hard against the grout lines to slightly recess them ?
Should you use the rounder corner of the grout float ?

Thanks,
Simon.