Issues with restoring a Time Machine backup onto new Macbook Pro Retina

I recently got a new Macbook Pro Retina and I've been trying to restore a Time Machine backup made today from my old Macbook Pro laptop. I didn't restore from the first start up (foolishly, seemingly) simply because of the trivial reason of wanting to see the system all clean and new.

I've tried the Migration Assistant but it gets stuck on "looking for source..", despite having the ex.HD plugged in and double checking the existance of the backup itself on the ex.HD.

I've also tried booting the laptop up in the 'restore' mode (cmd R) and restoring from there but it sends me in a constant loop of 'this backup was from a previous model of laptop' or something to that affect. It also doesn't display the recent backups at all, only displaying those from the beginning of this year for some reason. All backups are in the same place on the ex.HD so its not an issue with locating the backups.

Really stuck on this one! Would really appreciate some help!

Thanks a lot, and merry Christmas 🙂