How do I check if my laptop's RAM is upgradeable before buying a screwdriver?

Look up your exact laptop model’s service manual or a teardown video on YouTube to see if the RAM is soldered or socketed and how many slots are available. If you can’t find the manual, check the specs on the manufacturer’s support page for “Maximum Memory” and expandability info. You typically only need a small Phillips head screwdriver (size #0 or #00) and a plastic spudger — no heat gun or soldering iron unless you’re replacing soldered RAM, which isn’t recommended.