flocking?

What precautionary actions should I take to flocking my xt10i? I've never taken the mirrors off and am nervous about doing so. Should I do the whole thing or opposite the focuser and 12" above primary? My scope is a year old and has typical dust, is there any harm in just running water over the primary and rinsing with distilled water or should I just wait a couple more years until it'll really need a cleaning?

I havn't puchased anything yet, If you have any flocking tips/ suggestions I'll be happy to hear them. Thank you

When I flocked my 6" and 10" dobs I did the whole tube. But, I do planetary observing from within the city so my light-scatter potential is a fairly extreme case, and I have to go to fairly extensive efforts to mitigate it. If you're observing from a dark-sky location, opposite the focuser and just above the primary will probably be adequate.