Hi all, I have some (fairly modern/recent) wooden windows that are in good condition, except the double-glazed units need replacing. Easy enough job on plastic, but with wood not so much.

They are not the old sliding sash type, but more modern casement windows. One option is to replace the entire frame with uPVC, but that's overkill and expensive.

Any tips for how to remove the beadings so I can just insert new glass? My first thoughts are that the beads will likely be nailed in, so using something like a multi-tool might be the best way to go, so as to cut through the nails. Also any thoughts on what to put them back with, so as to seal it all?

Looking forward to your wisdom.