Keys 3 and 4

I have recently bought my first P38 4.6 HSE.

It came with two remote keys, they are labeled on the back key 3 and key 4.

My question is, is it easy to make them Key 1 and Key 2 so that the memory seats will work on unlocking the car? Or do I need to get it to a dealer to do this. (Probably not worth it!)

You cannot change a key 3 or 4 to a key 1 or 2, you will need to order new keys 1 & 2.