PR is personal record by the way. I’ve been working on some Olympic bar or barbell lifts. Some things to keep in mind if this is a goal for you…
Start with lighter weight dumbbells. The bar itself is 45 pounds. So if you are struggling to lift 15 lb dumbbells, work up to that until it’s easy.
I suggest working with a trainer for your first time using a bar. Work up to higher weight slowly. First time using the barbell should be just the bar without weight with good form until that is easy. Let me know if you want some tips.