Erol, You might want to move beyond 4.10.1 t test/verify. It was a major change with many defects. Suggest you upgrade to at least 4.11.3 and then do your evaluation (but probably best to go to current 4.12.1). Be sure to do a backup of your site before you begin so you can rollback with certainty if you choose.
The best approach is to clone your existing site and then upgrade the clone (usually called something like dev.mysite.com) and the you can test without having time constraints. Take good notes and you can then upgrade your production site at your leisure.