I was wondering about check in at Manchester, as the flight to Dublin is short haul but the overall trip is long haul. will check in at Manchester be 2.5 or 3.5 hours. probably obvious I know, just want to make sure.

How simple are the directions when getting off the plane to go to US immigration in Dublin?

I know it's been said that my bags are checked through from Manchester to Orlando but people I work with insist I will have to collect and re check in Dublin.