Transponder is a straight swap .. clips in at the top and screw holds it in on the bottom
The old blade can't be used as it fits at different angle to the new one so new one needs cutting , cost me £9 at local lock smiths
And the immobiliser pill looking thingy needs taking out old key and blue tacking into new fob
All this said worked for me if you bought the mk7 off the eBay link I posted last week ....
If any other type then not sure unless we can see it