I third What Jubilee Rose said.
Draw reins can be very dangerous aside from the fact that if you don't introduce the horse to them properly, you can cause a huge wreck. Also, if the horse decides for whatever reason to buck, you are SOL. You can't ask for enough lateral give to get you out of the jam. I know of a trainer who got very badly injured because of draw reins on a horse that bucked.
As for tying the head, ditto on what was said. Anytime you are forcing the horse into any position without any real reward, you're just setting it up for seemingly always needing to use this "trick"....it's not a long term and it's not safe and frankly it's not fair to the horse.
REWARD. Where is the release of pressure? Why should your horse leave her head where you want it...if there is no reward of a release of pressure in that frame?
Also...it takes A LOT I mean A LOT of consistent, correct repetitions to teach a horse to hold her self a certain way. It's not something you can get within a few weeks. It's a process. The horse has to be given time to develop the muscles to hold her neck and head a certain way. If this is forced, the horse can get sore and cranky and rightfully so. Also, it's not healthy to force it. So... take your time.
What's her motivation to listen to your cues for the headset? Give her a motivation, a reason to listen and to comply....by giving her a release at the right time....and you will get the headset that will be long lasting. You will get to the point where you just start to ask, and she complies willingly without fighting.
Also, if you don't already use a snaffle...I suggest you use a true training bit for this. Plain snaffles (no shanks at all) are good to do this kind of training. You can use the outside rein to ask her to give and the inside rein to massage the tongue to ask her to give. When she gives, even a little bit......you release. And ask again. And again she gives. You release and ask again. And as JR mentioned....it comes from the back to the front....your legs should be stronger than your hands which should be light and immediately sensitive to give reward.
You don't want to hold her in any position. If you do this...there is no motivation for her to listen/comply. There's pressure if she doesn't listen, there's pressure if she does,....why should she? Where's the release?
Hope this helps.