Mbappe is no small name when it comes to the football world and I believe he has been handling pressure for some time now and him wearing this iconic number will instead boost his confidence the more since he knows fully well the caliber of players that have actually wore and befitted that number of the jersey. His first season alone at Real Madrid shows that he is a player that open to grow and improve in everyway possible.
He has never made number a problem, even when he was at PSG where happened to be like their most top player, he was doing so well in the number he was wearing, I understand the number 10 is an iconic one but it will not be such that Mbappe cannot handle ans he is not going to be pressured by it he will want to do even more to prove he is a very valuable player to the team and will continue in that light to make sure to get a trophy to his name while with the team.