Grab a piece of scrap wood, fairly soft like popular, about 12" long and 1/2" thick, and start cutting wavy lines, zig zag lines, straight lines, circles, and some with real sharp corners, in it. Go from one end to the other with each exercise. After you have done that twice or three times, you will be amazed how easy it can be.
Trust me, BTDT!
Rog