Hot Water stopped working in Kitchen Faucet
Chances are either the valve seal has disintegrated and clogged the line, or other sediment has broken free and done the same. 

Disassembling a faucet is usually fairly simple. Remove the set screw retaining the handle, then start removing the exposed nut, washers, and valve components. Lay them out in order for correct reassembly. Check for damage and debris. 

If your valves are not soldered in (if they're installed using compression fittings), replacement is fairly simple. It's a good opportunity for even an occasional DIYer to get his hands dirty. Post a photo or accurate description for more assistance.