The first decision is to set your limits

Emotions.
Energy.
Sleep.
Travel.
Time. 
Health.
Money.
Friendships.
Power.
Sometimes, faith in the church.
Tragically, even family.

Decisions have a price.
Ministry has a cost.

I think everyone who chooses to work for a church must make a difficult decision.
A decision they shouldn't put off.
A decision which MUST be made before they enter into vocational ministry.

What are you willing to pay AND what are you willing to not pay?

For ministry will, inevitably, demand a price.
Caring for people, through the ups and downs of life, will come at a cost.

The most important question that needs to be considered is how high a price you'll be willing to pay and what cost will be too high.