I would add that when you talk to your Sir (as I’m sure you will), see if time expended or number of strokes can be limited and built up over time. I started taking short floggings of as little as 24 strokes and am now at about 84, my goal is to get past 150. The more you can take, the heavier the floggers he can use and the more pleased he will be.
As for the sub-space, I find mentally counting helps (also useful if he asks for a count as a test!). Hair pulling, clothes pegs on sensitive areas… there are all kinds of distractions that can be used (lying on a bed of thumb tacks really helps)… you get the idea!