When I used Allegro, I reckon it took me 3 months of quite heavy reading and customisation to become comfortable with the tool. There are some notes for the transition from Orcad to Allgro that are worth getting hold of, try a VAR or their support site.
The support site is a valuable source of information, solutions and work rounds.
Setting it up is the main thing, getting that and your working envoironment right (as with any CAD tool) is paramount to using Allegro. IMHO
Have Fun