Ethan, it depends greatly upon the nature of your product, and where (the environment) it is to be used.
From that, you determine which standards are applicable. An EMC test laboratory can assist you in mapping out what needs to be done.
You basically can then claim your product meets whatever standards it needs to meet, and can produce all the relevant test documentation and results to prove that it actually does so.
This is not as horrific and complex as it sounds !
Basically there are two types of environment, quiet and noisy.
An electrically quiet environment such a domestic home or business office, the equipment must not radiate much electrical noise that will interfere with other nearby equipment. But because it is an electrically quiet environment, your equipment does not need to meet very high noise immunity standards.
So for this class of equipment, passing emissions can be more difficult, passing immunity is dead easy.
An electrically noisy environment such as heavy industry, nobdy cares much how much additional noise your product belts out (within reason). But your product needs to have proven high noise immunity so it will not malfunction and perhaps create safety issues.
For this class of equipment, passing emissions is easy, but passing immunity can be more of a challenge.
The standards are usually not that difficult to meet. Good engineering practice very often will get you through with only very slight changes required, if any. These rules are not there to drive manufacturing business bankrupt, but to weed out truly awful products.
Have a good look at a competitive product that already complies, and see what they have done as regards design and engineering. If your product is built to a similar standard, it too should pass fairly easily.
I suggest you look up a local EMC test laboratory in the telephone book, and go over there and have a chat with one of their engineers.