In reply to KellyBlackmore Lee:
Depends... Depends....
They are leather and might stretch a tiny bit, but probably not a huge amount due to fabric lining. So don't expect stretch like some leather only boot from many years back which some out of date advice might reference.
Personally I size my boots wearing normal socks and don't wear thick socks, but I'm weird and that's not the norm. (For example I'm also an enthusiast for wearing wellies on mountain days and scrambling, so I'm an outlier) But it depends, there is no set formula for everyone.
Suppose you suspect they're tight to walk about all day about the house in normal socks, then they're too small or maybe not the right shape for your feet. If you'd be fine in normal socks, then walk in normal socks
You need to be getting every single mile into your legs and feet in boots, that you can between now and then.
Good luck!