Moving from WP.com to self-hosted

I’m trying to move a blog on wordpress.com to a self-hosted one. I was having issues moving the media files, and managed to up the memory, and it imported for quite a while, then said it couldn’t import a few images and all of the posts, however, it didn’t give me a memory error this time, said it was successful – except for those items.

I have almost 400 images in the media, and when I looked, it only imported about half.

Can someone help me with a better way to export/import the images? Thanks!