You will need to get used to double triggers, assuming the 500NE has them. Also opening the gun and reloading. This is best done with a shotgun IMO. Relatively cheap, lots of shooting, no limitation due to recoil. I would try to find a double trigger SxS shotgun to barrow for some time at the skeet range. Shoot from a low gun position and shoot the doubles stations, as well as the singles staions using one and the other barrels til the two triggers become second nature.

BTW, Buzz Charlton points out in his video that many of his clients who shoot DR's forget about the second trigger and this is an issue. In his video there is one scene where a fellow misses the oportunity for an easy, nearly broadside second shot when he get lost in the triggers. Instead Buzz puts in a shot and the fellow gets his second shot as a going away shot.

JPK