Replying to Yes, I am an idiot but SPKs

I bought my SPK boots online (stupid) because I had just had a shop fit me out with new snowboard boots (size 27.0) so I went ahead and ordered 27.0 SPKs. BUT I get the worst shinbang ever. Today I can barely walk, and there was one day when i couldnt actually even get my boot on. Now I'm probably going to get lots of "your riding backseat" comments, but watching videos, seems like everyone lands back all the time. So am I doing them up wrong or what? Should I sell them and have a shop fit me with a completely different boot?