High speed fight the 109, the yak has much better high speed performence than the 109f. Also since the 109f is the "best" 109 varient, and it also has the best turn radius of all except the 109E, i wouldn't suggest getting into a turn fight as well. I've flown the yak and it's kinda mushy at low speed handling so i would keep your E when dancing with a 109F.
Key to beating a 109F is to exploit it's poor cockpit views and high speed handling, if you can keep the fight above 300-400 IAS you shouldn't have a problem with a novice 109 pilot. But a experienced pilot will lure you into a low speed fight were the 109 really shines. Hope this helps.
PS: were is motherland where u need him, lols