First a word of caution, Side slipping WITH stalling is called spinning !
Most light aircraft will side slip without problems but you MUST maintain a greater margin above the stall so look for about 10 KTS above the flight manual approach speed ( get the number from the flight manual and NOT any place else).
Practise this at a height that a recovery from an inccipent spin can be recovered from.
Check the flight manual for side slipping prohibition, some aircraft with full flap selected can while being side slipped can have poor elevator pitch control.
Side slipping is a very valuable technique regularly use by glider pilots who don't have the luxury of putting the power on and trying one more time, I can't understand why more power pilots don't use it.