Now it depends on whether or not you can stomach it. A great deal more than fees will be deducted from your account. Your inventory will be lost and destroyed, your parcels will not reach your consumers, your products will be returned for no apparent reason, and the returned items will be damaged.
If you are a novice, you will determine this for yourself. Join a Facebook group and participate in its conversations. FBA is NOT for the faint of heart or financially constrained.