Jimmy, it's not just the electric motors you have to worry about, but the Battery and esc also. I use a watt / amp meter
and test my props before flying. check the speccs of your motor and esc and make sure you never exceed the limts.

Example: my sig little extra has a Park 450 outrunner rated at 14amp continuous. I use a 20 amp E-flite ESC. I have the plane
propped to pull no more than 18 amps at full throttle (10x7 apc slo flyer). I propped down to 10x4.7 and got 16 amps full throttle
and around 12 amps at cruising speed 3/4 throttle. Battery is a 1300mah rated at 20C so it can handle 26 amps continuous.
now that I know what I what my limits are I can experiment with props in this range 10x3.8-11.5 slo flyer until i find a prop that
gives me the performance I want (perfromance measured by feel while flying)