Thanks everyone for your replies, what we are planning to do is move around the 6 month mark. I am hoping this will be alright....I know it's not ideal but I know others do it, I won't be doing any lifting etc. I don't think DH would let me even if I wanted to!!

I think we may even get removalists to move us, it might just be easier, when we have moved in the past FIL has helped us moved but PIL are moving to NZ on the 21st of this month. So it might just be easier this way.