JGB:
Here are some rules I have found useful in the practice of sacrifice.
1. Any desire for reward the creeps into sacrifice destroys its value.
2. Be intelligent in your choice of objects to sacrifice.
3. Do not sacrifice at the expense of others, unless you are able to make it up to them.
4. A half hearted sacrifice is not much of a sacrifice.
5. Sacrifice what is precious to you in this present moment.
6. Never bargain over sacrifice.
7. Do not be fool-hardy and attempt sacrifices that you will regret.
8. Measure what you can bear. This is the measure of what you are.
9. Search yourself for attachments and ask yourself whether you are ready to sacrifice any of them.
10. Right sacrifice is made for a good reason, but not for a good result.
11. Keep your sacrifices hidden from others, or if this is impossible contrive to make it seem that you did well out of them.
12. Sacrifice must not be the result of struggle, but of decision. It is a decisive act that is made in a moment and there must be no hesitation or second thoughts once the decision is made.