Instead of playing a trainer 4k for a level, just go town to town buying all and any leather and leather strips that you ever can (even hunting alittle for leathers help).
But the thing you need to craft the most is keep creating leather bracers (1 leather, 2 leather strips) and make hundreds of them. They level up smithing insanely fast and they're cheap and you can even sell them all back. But for more XP be sure to sleep.
Sorry - this is rushed. I can explain more later.
