how is the park tool hhp-3 press? Any better than a homemade bolt and washer setup?

I'd prefer to install the headset myself and gain a new tool (and a new skill) in the process.

Honestly, if you are going to spend that kind of money, I'd get either the Sette or Nashbar presses, the are extremely similar to the higher priced Park HHP-2 I own the Nashbar press and it works great...but you can honestly do the same thing with the washer and bolt setup.

https://www.nashbar.com/bikes//Produc...2_125105_-1___

https://www.pricepoint.com/detail/146...-Cup-Press.htm

I've never used the hhp-3, but the primary advantage of a purpose-built tool for this is that it should help ensure that the cups are pressed in straight. This can be done with a home-built tool if you're careful during the installation. If you only need this for a "one-off" project, I'd say use the home built version and stay attentive. If you think you'll be doing this on a routine basis (e.g. "bike flipping") get the Park tool.