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Cheers and @nathwilson22
It's top hung and probably not too far off a SqM so seems pretty awkward to do from the inside I'd have thought.
My thought was one person up a ladder holding it and another on the inside doing the screwing/unscrewing. I can't really picture how there would be space for one person to hold it and another to fix it from the inside.
aggi-
Without access to a Sashmate, removing the glass could be a sensible idea if it's internally glazed.
https://glazesafe.com/sashmate-user-images/If there's a window cill just below, you can often slacken the bottom hinge screws sufficiently to allow the hinge track to pivot around them. Remove the upper screws and allow the top of the sash/hinges to go outwards and guide the bottom of the sash to rest onto the cill.
Undo the two remaining screws and bring the sash inside.
user69121
Dont do it from a ladder!
Even ground floor ones are usually easier from inside.
A normal double glazed unit is 20kg per SqM. Add on some for the frame and hardware.
Especially if its a top hung window, you'll have to hold it in place while getting the first couple of screws started when putting it back in.
Good plan if its side hung (a hinge top and bottom on one side)
Top hung (a hinge either side at the top) is more awkward as you need to support the weight more when removing the last screws and more so getting it lined up when refitting.
Wrapping a cargo strap around the sash makes for a useful handle.
Have a couple of screwdrivers on hand as dropping one would be awkward if there's only one screw holding the sash