Any DIYers? Window beginning to jam, what should I do?

[colddietcokewithice]

The windows are probably due replacing (20 years old) but not something I can take on. I'm having to pull and bang the handle to get it sliding into place after being opened.

What are the windows made of?

Wood.

Check whether both the window and the frame are still square. If they are, then it may be the hinges have come a bit loose, check them. Or the window could have swelled up, make sure the paint on the outside is in good shape so the wood doesn't take on water.

Thank you. It's shut for tonight so that can be tomorrow's job.