In addition to all the valid comments above, keep in mind that there is a trade-off between ease of use and flexibility. I have a Leigh jig that can cut dovetails that can look close to hand-cut, but I have to get out the manual and study up on it for at least a half hour every time I use it. Anything homemade will likely be easy to use but might not be as flexible as you'd like. If you're willing to go with the solid, accurate but easy to use type, look for a used Porter Cable jig which can usually be had for a fairly reasonable price. OR learn to do 'em by hand. That's what I do for a small project like a blanket chest, reserving the jig for the chest of drawers!