Yeah, its not too hard if you've built a few pedals before, but it may be quite difficult for a first build. Maybe try a booster/fuzz/distortion/OD the first time around.
I'm not very active here on UG currently.
I'm a retired Supermod off to the greener pastures of the real world.
the first pedal I built was fuzz and it turned out great, it's probably the easiest to make also and cheap.
Yea, you can build one yourself, you can also build one with your mom, or your dad, oh yea, your dog too.

Just ****ing google how to making a phaser or a FLANGE