I, too, agree that your field guns will work just fine for skeet. I also agree that skeet or cylinder choke with 1 ounce of #9 shot is about perfect for skeet.
Assuming (and perhaps that's a big assumption
) that you know the proper stance, hold, and lead required for each station, you should try to shoot twice per week. Shoot 3 rounds of skeet each time. Concentrate on each shot as if it's the only shot you will be shooting that day. Hopefully, you will make the shot, but even if you miss it, don't dwell on it. Shift your focus to the next shot. Before you load the gun on each station, you should review mentally what is required to break the target(s) from that station. Be calm and confident. I know that is easier said than done, but sometimes you've got to fake it before you make it.
If you will follow this procedure faithfully for 3 months, you should be breaking about 23 per round by the end of 3 months.