Hard ? In my 15 year of programing systems one thing i learned, nothing is to hard or to easy, if somebody made it hi made it fore somewhone else, so if you onlu used windows family software unix if very diferente than windows, but i think that in 2 months of work you can 70% operate solaris, linux, unix software.

But if you only whant to use db2 database i thinh 1 month of training if good.