I love second hand stuff- but it pays to be discriminating.
Buying clothes, collectables, plates, dishes, ornaments, books, decorative items, some furniture, curtains is low risk. You can check in the shop for tears, wear, stains, missing buttons, faulty zips etc.
80% of my clothes and furniture are second hand.
Buying other types of second hand stuff is a pig in a poke. Electrical- I would not consider, anything mechanical, like a child's bike ( unless you are handy with repair skills), car seat, baby equipment safety stuff, cycle helmets, buggies, prams- it is a risk.
you don;t know the history, faults are not always obvious in the shop, some items are hard to clean,and getting a refund may be tricky.
Overall I love preloved stuff, but some of it I wouldn't touch.
Being selective is the key.