Moving levers for 3D printing v2.8

I’m trying to make a simple machine that I will print. When you pull up at A that lever will rotate on it’s pivot point causing the next lever to rotate lowering B. Eventually B will get low enough that it will release the catch and the spring will allow the 3rd lever to spring up. What I want to do is experiment with the lengths of levers and pivot points to get the desired result. Is there an easy way to set this up, or would I be better off just rotating everything by hand?
FYI I have only recently dealt with armatures and rigging and am not very familiar with it.