Good luck with it! I had no problems with my Zendel trigger being shipped, but I also just gave myself 'until it gets here' timeline, to take the pressure off.
I left the disconnector in. In talking to people at CGW, they indicated that it was their preference, as it wasn't doing anything. However, the guy I talked to also said leaving it in would probably never cause any problems. It was just a preference to remove the part that is unused.
My preference was to leave it in as it doesn't affect trigger pull feel and this way I am not likely to lose it if I switch triggers back to DA/SA in the future. I've got too many bins of spares and take-offs.