try get a bucket that the seal will fit in . put the seal into the bucket, get some boiling water, pour it over the seal, keep the seal under the water for 5 mins, this will make the seals rim very soft and easy to work with, and will make it easy to fit on, and when the seal cools down it will get hard again, but it will be on the door by then, just be carefull with the boiling water,, use gloves,and something , to lift it out of the bucket, brush handel ect..
h, January 2012