When you sand ( before priming), have a trouble light in your hand and hold it at an angle. When you do it you will see what I am saying- it will improve your sanding a billion percent.
After you prime, do the same with the light and touch up with mud where it needs it, repeat process, reprime.
With practice it will get better!
After you prime, do the same with the light and touch up with mud where it needs it, repeat process, reprime.
With practice it will get better!