The best way to get in state?
Easy!
Just think of what you want.
The tangerine, starts with the eyes closed for a couple of seconds (can be a blink) what is really important is the thought... what you think is so much more important than 100% action correct. The actions whatever you chose to take one are "your" triggers. What you are doing when you place the tangerine is setting your intention and then using "your" actions to click it into place fastest. The best way to to that is to be consistent.
So close your eyes... imagine the tangerine or bird. place it at the top back part of your head by touching there. You now have a physical sensation that helps you to concentrate. Don't worry about it after that... if you find your concentration wandering off... 'think', just think of the tangerine again and 'remember' the sensation you got when you touched there and you back on track.
Things like this isn't about getting it 100% right the first time. It's about repeating the small successes over and over again so that they build into the larger whole. It's about going...ooops I'm steering off track and moving the wheel a little to get it back, sometimes we over steer so we adjust again.
Like when things move. We keep adjusting to stay on path. We cannot lock in a straight line if the road is bumpy. So we adjust to return to the direction we want to go.
Now don't try so hard, just go through the motions! Notice what works make adjustments where it didn't quite work then do it again.
Even the books that you photoread require slight variations depending on what you already know, what you want to know, how fast you want to know it.
Photoreading isn't like flipping a light switch, even lights don't work sometimes when the bulb has blown or the electricity is off... so you make adjustments (candles perhaps?
)
It's not an exact science. It's a collection of actions that when repeated often enough build a stronger muscle of intention.
You get into the state easily every time you use the technique. Put aside the doubt for a while and try it and see 
Alex