I don't understand the 1900 and 2000+ part. Are you trying to say that's a goal of yours?
As for being 1000 rated and wanting to improve at the endgame, a lot of being nervous comes from lack of playing experience. Once you play many king and pawn endgames, you'll have a better understanding at how to convert them successfully and this will make you less nervous. You'll just trust that your position is good and play on. Here's some videos of mine you may benefit from checking out:
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