Is it possible to unclog a pipe without calling a plumber?

Avoid aggressive chemical products at all costs - they can mess up your pipes in the long run. For something light, a good old plunger usually does the trick, or you can try baking soda plus white vinegar to soften the clog before using the plunger. If it's really blocked and nothing's going through, then you gotta accept calling someone, but honestly 70% of the time you can sort it out yourself with a bit of patience.

The thing people always forget is that a plunger works like a thousand times better if you actually fill the sink or bathtub completely with water! Not just a little bit of water, you really need to have pressure. And personally, before you start messing around with home remedies, try to see first if there's a hair or something stuck on the surface you can grab by hand - I've saved so many pipes just like that! If it's actually stuck way down in the pipes after that, then yeah you can step it up with baking soda and vinegar or a plunger.

If it's really clogged, before you wear yourself out with a plunger, try checking what's blocking it - sometimes it's just hair or gunk you can pull out directly with a hook or even your fingers with a glove. Takes like two minutes and saves you from struggling for an hour. Then if that doesn't work, yeah the plunger becomes your best friend, but you really gotta put some pressure behind it like someone said.