Practice some extreme slow flight, with the stall horn just screaming, and lots of power on. Just keep the plane balanced there. You will get the feel of the pitch forces very near the stall, and the required precision of control in roll and yaw. If it breaks in the stall while doing this, pull off the power, and recover normally. As you practice this you will realize that you can enter or recover that stall at will.
The 152's stall warning horn is particularly good for this, as it will produce an intensifying sound with the deeping approach to the stall.
As for the recovery with lots of altitude, what's the worst that can happen? You're pointed down, recovering form a dive - that's okay.....