you should have enough throws that you can hold altitude inverted....this requires you to put in,with the stick,down elevator to hold the nose up (remember you are inverted). why do you want to learn that,because you use the push while inverted in other manuvers...a loop, slow roll, cuban 8 to name 3. oh remember this when you're inverted...."when in doubt, roll out" don't loop out
As far as full throws go...set the airplane throws to recommended and leave them there.....I've never had an airplane that I had to use full stick movement to control...once you get better then go with dual rates......Expo will make it easier no doubt.....but nothing worth while comes easy...