The timing thing takes practice. As Steve-R wrote, practice, practice, practice.
Here's a thought experiment for you that might help...
Tap your finger on your desk. Bonk, Bonk, Bonk...
Now say "click", in the half beats. Bonk, "click", Bonk, "Click"...
If the Bonks are the downbeats of the tune, you can make a perfect loop by tapping the start/stop button on the half beat clicks ahead of the downbeat. This works just fine for a large number of tunes.
Now to get it a little finer, say "click, click" between each Bonk. If you train your foot to press the start/stop button on the second click, you'll have gotten even closer to the downbeat, which is what you're trying to do.
Your foot needs to be trained to press that button just a delicious slice of a beat ahead of that downbeat - EVERY TIME.
Once you've gotten this you can concentrate on adding in and pulling out pieces.
Have fun!
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