Generally frustrating as I feel your actions are constrained to how effective your carry is at farming and map awareness. Defending him in lane only gets you so far if he's terrible with his hero and/or last hitting. Or its difficult to roam as he's so busy failing at last hitting that he won't look at the map and if you're not there to bail him out he likely dies.
On that note and as somebody who wants to get better as and enjoys support the most, are there any pointers people can give to dual laning as practically every guide out there about laning deals with tri lanes. I suppose that sounds like a basic question, but I'd like some pointers as there's obviously stuff I'm not doing to the best of my ability in order to more easily win my lane so that I can possibly roam without risk of my carry being in danger.