If you are at that level .... don't underestimate what you already know
a book will cost �30-40 121 will cost far more ... (work it out on your sheet!)
I teach MS Office - and you can see in people's eyes the "advanced" stuff is such a dissapointment to them ....
(they also get a qualification ... which is the purpose) ... but once you start seriously using any tool the specialist skills you develop are ingrained
when I was a programmer (software eingineer!! - ha!)
I mainly wrote a very specialised niche type of software ...
and used 4 or 5 different packages in the time I did it.
the first jump was the biggest ... and what surprised me most was how easy the move was - The difficult bit was working out how to get from a-b but once you know that ... most languages (that I've used) follow a very similar set of rules.... logic is logic if x, y =z.
office is office ... Lotus to excel - there were about three formulas that were different - the rest just used a different .... but consistent syntax. so a+b became =(a+b)
commas replaced fullstops
I'd buy (or borrow)a book .... get an idea of what the differences actually are before you pay for anything