just feed it in with a screw driver,carefully.never used glue meself just buy best quality seal.you do need to remove door,or you could get someone to hold it up and just remove top guide or cut seal,but dont :roll:
Did all my seals last week and the sliding door was by far the worst cos couldnt get all the old rubber out of the channel as the slider was in the way. Put the new seal on but didnt remove the door and just cut the seal and glued back together once in. Had good seals which fitted well which really helped!