I’ve found that the productivity of my study of OPAR has increased by at least 50% (if it’s possible to give a number to it), by doing the following:
Take your copy of OPAR to Kinko’s. Tell them you want a spiral binding on it. They’ll cut off the spine and affix said spiral binding. The book will like flat on your table/desk, and you can thereby use both hands to take notes, eat your breakfast cereal, etc. It helps a lot more than you’d think and costs about $6.00 + tax.
I’ve done this to other books as well and it really does make your study more productive.
Have fun!