Hayley you turning into a cleaning geek
As long as your sensible all will be fine - bear in mind that by stripping off any products may make your car look worse than before you started anyway before you re polish and wax.
Most of the things have been covered, make sure you use plenty of detailing spray or soapy water. They clay should glide easily, you should only need enough pressure to make sure the clay can glide easily over the paint, no need to apply pressure.
Keep kneading folding the clay to give a clean face, pick any big bits of crap it picks up out of it, if it looks tired can wont fold clean, change for a new piece, cutting the bar into pieces is a must.
As it is nice an warm at the moment you should not have problems with the clay being to hard, if you do it on a chilly day make sure the clay is soft warm and pliable. Should be soft like Blutack.