I agree with Bubbagates,

Are you working on a simulator? When I started out with knife edges and rolls using rudder input I think I practiced it on the simulator countless times. By the time I tried it at the field, the stick movements were imprinted on my brain. Even though you are trying to do horizontal slow rolls, since you're just starting go ahead and pitch up for the roll - if you do it right, you will stay in climb at the same degree as when you entered and it might give you more time if you get crossed up again.

Definitely inverted flight as stated above. Start out with just straight and level segments of inverted flight. The more you get comfortable with it, try turning. As with anything, start out trying new things up high.

Something I have noticed also is and this just may be me - but alot of people use super low rates because the airplanes seem too responsive on higher rates and it scares them - but if they get into trouble they don't have the roll rate or the elevator to get out of trouble. As you get more time on the plane and learn its characteristics better you might want to increase the throws (not too much, just along the lines of your comfort level).