I think it has been mentioned here you don't aim a shotgun, you point it.
Losing sight coming out of the house
??? Losing sight of the bird coming out of the house? You shouldn't be trying to pick it up just coming out of the house; All you'll see is an orange streak for about 10 yards. Try a slightly higher hold point. By the time the bird comes into your view, it will have slowed down enough that you can see detail. And despite what you are thinking right now, yes, you DO have enough time to hit the bird when doing that, unless you are shooting from the 27 yard line, in which case,
you should be coaching
me.
Covering the target with the muzzle of the gun
If you have a field gun with a flat rib, you will
have to cover straightaway and slight angle birds with your barrel. On harder angles you won't, because you are leading, but the next one is where you get misses on harder angles. If you are using a gun with a raised or adjustable comb, and/or a high rib, you 'float' the bird just over the barrel on straightaways and slight angles.
Sometimes I stop moving
@The gun
This causes misses at the harder angles all the time; Follow-through is necessary, unless you have a Cray supercomputer hooked up to your brain.
Do you mean where your gun is pointing when you call 'pull'? See the answer to the first problem. Also your eyes should NOT BE LOOKING AT THE BEAD! Once you mount the gun and are sure it is mounted correctly, you should be looking past the bead out about 10-15 yards past the traphouse, in what's called 'soft focus'. This is where you'll pick up the bird.
If you are right handed try these 'hold points': Station 1: 2 ft. above the back of the traphouse and 2 ft. to the left. Station 2: 2 ft. above the back corner of the house. Station 3: 1 1/2 ft above the middle of the house. Station 4: 2 ft. above the back of the house, and 1 foot to the right. Station 5: 2 ft. above and 4 feet to the right of the back of the house.