You can make a tree for sure, and if you stay at this for any time, you’ll build one sooner or later. I made lots of bows without one so it’s not a must. A tillering stick makes it easier by letting you draw it a step back and look at the bend, but even that is not a must. You can have someone draw the bow and just look at it and note where you need it to work more or less. Just depends on how you want to proceed. Spend time building these devices before you move forward or spend that time building a bow.
