How can I remove stickers from the lid of my MacBook Pro?
Just peel off the stickers.

The best thing for removing the residue is Teatree oil. You can get it from Walgreens in the US, and most chemists in Australia.

Just soak some cotton wool (or other soft cloth) in the oil (so you don't scratch the surface of your MacBook) and wipe until no residue is left.

Because the oil is viscous I would make sure that your TimeMachine backup is  up to date before use.  Don't kiss your brand new looking Mac as the oil is poisonous if ingested.