Engineering/Mining is a very popular professions choice for Hunters. Engineering is a very versatile craft and it is capable of doing many things. Do be warned though, do not take engineering if you're looking to make money. Most of the items you make require skill in engineering in order to use, with a few exceptions of course.
If you're only wanting to take engineering to save money on making guns you may as well pick another profession. Guns are not very expensive to buy from the AH, and making the gun will not save you a lot of money due to the amount of time it takes to get your own materials.
Since there is no type of woodworking skill available in the game yet, some hunters take engineering to make their own ammo. Crafted ammo do more DPS than store bought ammo so that could be a factor for you in the end-game.
Also... goggles are not the only head item under level 25.