Hi Walter

There's not much more than simply putting the PIC to sleep and turning off all peripherals you can do without. All these add up to give you a truly low power sleep operation. Typical drain should be in the 10s of uAmps if you have everything set up right.

The things to watch out for in low power sleep
1 - Disable the peripherals you do not need (saves some power)
2 - Turn off all ports which are draining power. For example, if a pin has a pull up on it, turn that pin high if you can afford to do it (should not turn on some device that you do not intend to).
3 - Keep an interrupt enabled so that you can get out of sleep

I use sleep mode quite extensively and get almost the shelf life out of my batteries

Regards
Jerson