The pool should be fine for a couple of days without water in itTo prevent rain damage and spring tree droppings on the bottom, I'd leave the old liner in until, at least, the day before the new liner gets installed. I imagine that some sort of touch up on the floor will need to be done before the new liner goes in - now is the perfect time to fix any humps or dips in the floor.
If you aren't comfortable with installing the liner yourself, by all means hire someone to do it! I would suggest that you be there and watch and help with the installation so you get an idea of what's involved so that you might have more confidence in doing it yourself if (when) the liner needs to be replaced again.
I hope all goes well with the install and that you have a GREAT season with the pool![]()
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