I picked up a Cyclus headset press from bike-components.de and it was delivered today. I am installing a Cane Creek 40 1" threadless headset on my Fondriest frame and I've not used a press before. This one has the stepped guides top and bottom. The cartridge bearings come out fairly easily.

It makes sense to press one cup at a time, just to avoid having to line up both cups precisely at the same time. Grease on the outside of the cup where it enters the headset, and grease on the threads of the press too. The stepped guides should keep everything in alignment. Maybe after a few headsets' worth of experience, doing both at the same time would be OK - but I'm thinking not the first time.

Any gotchas I should know about before it do this?