Having your home appraised is quite unlike anything you may have dealt with previously. A qualified person is coming in to your home to examine how everything looks on its surface and determine exactly how much your home may be worth. To say the appraisal process is confusing for many people might be an understatement.
When it comes to any home appraisal:
Getting your home appraised isn't really stressful, and it's an essential if you're buying or selling a house or condo. Having a scientific explanation of value before setting a price, even with Realtor advice, allows you to set an optimal price that's neither too high (so the home languishes on the market, or discourages buyers with multiple price drops), nor too low (so the home doesn't deliver all its potential value toward your finances for your next purchase). Since the cost of an appraisal compared to the potential return is quite modest, it's really a no-brainer.
In the same way, if you're buying a home, don't forego the appraisal. Even if the bank conducts an appraisal, which it will if you're getting a loan, get an independent appraisal yourself. It's too easy for a bank appraisal to not tell the whole story and to be too generous with the estimation of value. You want the equity you're hoping for to really be there. Compared to the potential loss from not doing it, a pre-purchase appraisal is a drop in the bucket. You're already getting a home inspection and termite inspection. The pre-purchase appraisal protects the financial side of your investment by giving you documentation of value from an independent source.