Tube Testing - any recommendations

Hi all, I’m about to embark on my first restoration of a piece of tube based test gear. It’s an old Heathkit Oscilloscope from the early 70s. I am looking for recommendations for approaches to tube testing. Do I seek out or build a tube tester or just test in circuit. Anything else that I should look out for, besides the usual concerns about high voltages on the chassis, and old degraded components. Regards, Mike Willegal