To my perception, if someone has worked on any small business accounting software, he/she can work on QuickBooks.
Bhai, in my opinion, just install it, and start practicing with user help manual (if available) or any book on QuickBook. Spend some time on A/P, A/R, GL etc.
However, its only my opnion which may be different from yours.
As far as Quickbooks is concerned I totally agree what you have said, (in fact i have used it and peach tree as well) but does it hold true for Sage ACCPAC also. I was told that Sage ACCPAC is bit difficult ERP.
Long ago, I think arround 2002 or perhaps 2003, I worked on ACCPAC. At that time it was not much complex. I didn't get a chance to use it recently so I don't know its difficulty level these days.
Still, I would suggest to try it by yourself first and having a basic book beside on your desk for quick reference, specially if you have worked on computerized accounting software already.
Yaar, Pakistan main logon ko daraanay ki aadat zara zayada hay.
Hmm, agar mein aap se ye kahoon k aap oracle erp business suite pe kaam kar lein? I mean uske complete manuals bhi mil jatey hein pdf format mein aur solutionsbeacon.com pe aap online practice bhi kar sakte hein. Aik month k liye aap register hon for free aur practice karein. Sirf aik problem hai is mein k aap ko set of books nahee bananay de ga. Reason ye hai k already poori dunia se itne logon ne apni books bana li hein k solutionsbeacon.com walon ko masla ho raha hai.
Ye link hai oracle erp business suite k manuals ka. Help yourself