If you manage your property yourself, you will save on costs otherwise billed as “fee of property manager”. You will also be safe with the idea that your profits (and losses) depend upon your own diligence. Great!
However, the other side of the coin is that you will be personally attached to the property and in due course of time, the whole affair of management may become a stress-inducing exercise. Add to this any shortage of market or industry knowledge on your part- which is all too possible a case.