It's not all that difficult or complicated, really. I know I put up a quick and dirty video https://youtu.be/8VgsT1CddNc on this issue, but I had very little time that day. Slow down the video in YOUTUBE to half speed and pause it when you need to. Watch it a few times and you will get that AH HA moment...
Keep in mind this is an animation software, not a drawing software. It's very powerful. but you can tame it to simulate lines and curve drawing, Maybe I can put together a new video next week that actually explains what is going on. Then you will understand how easy it is. Feel free to bug me if I forget.