I usually commit often locally and push to remote right away. Then when I want to open up my PR, I use `git reset --soft <target>` where target is the local version of the target branch in my PR. That resets all the commits, but keeps all the changes in the staging area, and then I can clean up my history. Then I force push to override what's there.

This works well for my workflow because we squash all commits into target branches and don't really rely on commit history auditing during review. I understand that's not the case everywhere, but works for me.