I like the personal authority approach, you get her to know you and you mention the fact that you are expecting them to show up at the time you established, if they are running late, they call you, but as a man of your word, you make sure you show up on time.
I never call them before hand, since when we establish the date/time i let them know that i will be there at the time that i said. Period. If you have done your homework, they will be there at that time, and you will come out to be a man who does what they say and you will stand out from the rest.
Example: I will let you know all the steps for one of the girls in my life.
I have met this girl though a bunch of friends, when we went out to a buddy of mine's to have a bbq on sunday. I noticed a bunch of ioi from this girl, and I approached her after i was done eating. We exchanged a few details and went on about the horoscope and her traits based on the year she was born (this is a topic that i know well, I would recommend that you find a topic that women are generally interested in, and learn as much as you can from it)(My take on the horoscopes is that is a guide based on what month a women is born and the commonalities, such as if you are an Aries, you are always busy, or planning something.) My buddy Mike was suppose to take me home that day, but when he came and asked me if i was ready, this girl replied, in a joking matter, that he couldn't take me home because i already had someone else(she meant herself). And i replied, "I will be in good hands." That night we went out, and had dinner. I made sure I payed for the dinner while she was in the bathroom putting more make-up, and when she approached me about paying for the dinner, i told her, that i disliked the awkward moment when it came to pay. So i had her covered but she owed me one.. jokingly offcourse. At the end of the night, i left her with a kiss close, and mentioned, to her since i already new she was free on wednesday from one of our conversations, I said: I am free on wednesday, and i will be content with your company for now(jokingly) I will be there and pick you up at 6:00pm so we can explore the city. She confirmed this by saying i will be ready.
***Important*** Notice that there was a 4 day gap, but we had establish a date and time, i never called/texted her at any given moment.
If you want to save time, make sure she knows that you are this type of guy that does not put up with BS from her, and that you expect her to be ready on time.
On wednesday i showed up exactly at 6:00 to pick her up, only to arrive and have her not ready... What happened? She thought that i was like every other guy that i was going to leave her waiting/ or that I was going to be late, since she never got any call/text from me. When she finally came out, i told her, that next time she has to be ready, because that was rude.(Firmly) Women, don't like to be rude. She quickly dressed herself, and we went out and that day we "closed".
Two days later she came to me and mentioned that she had never met anyone like me, and that she was glad she had found someone special to spend some time with because unlike every other guy out there i mean what i say. She is a HB9 and we have a solid friendship.
Guys, just remember to portray yourself as a different guy from the rest, which does what he says, and expects the same, don't take BS, and Have Fun.