1) how much science? hmm depends on you, some poeple view psychology as a science i.e the science of the mind, but it isnt hardcore traditional science like physics and chem. There is a bit of biology in it, but all interesting stuff, more like anatomy than biology.
2) is it hard? no, nor is it easy, its a very interesting subject and if u have to drive and are genuinely facinated it will seem really easy, if not it might be on the hard side
3) there is a moderate amount of stats because the way psychologists do their studies is based pretty much on stats, so each year you will usually do atleast one stats subject which is kind of an easy form of maths really, its not like staring at pages and pages of tables and stuff, just most results from most studies are presented in tables and so on
if it interests u, you will love it, iam really enjoying it so far