Uh, I actually did this, it wasn't so bad honestly it just took about a day to rebuild everything.
Honestly the Sony VAIO that I had was _awesome_ in some regards, the hi resolution display was extremely crisp! It fit comfortably in my inside jacket pocket, the battery didn't suck.
The only issue I had honestly was the proprietary connector to get ethernet (though this was more annoying in 2012 when I was doing this, these days laptops don't seem to have ethernet); the only other issue was that the GPU was extremely slow with Linux.
it was probably extremely slow in Windows too, but vista (which was installed on the thing) was far-far too heavy to understand why it was slow at all.
The nearest best laptop I've found that is in all areas superior than the Sony VAIO P-Series (aside from being a bit taller) is the GPD P2 Max which is basically perfect.... if only it had a passively cooled ARM CPU.