MacBook Pro upgrade to SSD migrating OSX and Bootcamp partitions

I wasn't able to find the info I needed here or on Apple's own forums or via Google, so here goes.

I have a MacBook Pro 15" early 2011 model with a 500 GB internal hard disk drive (non-SSD). Currently running OSX 10.8.5 on a 300 GB partition, and Windows 7 via Bootcamp on a 200 GB partition. OSX is under backup via TimeMachine, Windows is backed up manually on an external hard drive as a simple copy.

I would like to replace the internal hard disk drive with an Intel DC S3500 480GB SSD. Changing the drive itself should be easy via a guide I've found. But... instead of the 300GB/200GB partitions I currently have, I'm aiming for 400GB/80GB partitions on the SSD. The Windows 7 Bootcamp partition I currently have uses only 70GB, so I'd like it to occupy the 80GB partition on the SSD. Once I'm on the SSD, I will upgrade OSX to Yosemite.

Question: I would like to migrate both my current installation of OSX and the installation of Windows to their respective new (differently sized) partitions on the SSD, without having to re-install the OS'es. What steps do I need to take to make this work? (Any pitfalls?)