This is going to make some interesting fodder for Comments You Will Not Hear. I have read the Kool-Aid on prayer, and I already see the non sequitur that just because Jehovah answered select scriptural prayers, you need to trust Him to answer yours as well. That is crap.
Those cited prayers that were answered all have one common denominator. I have learned to look for such, and in this case all the answered prayers were for doing Jehovah's will! That was about the easiest common denominator to find. Whether to help Isaac find a wife that was a servant of God, to help rebuild Jerusalem's walls, or to help missionaries in Asia Minor get their missions complete, the articles being prayed for all had to do with getting God's own will done. Were He to not answer or to delay answering, He would have only been shooting Himself in the foot, since Satan would have been victorious. In all these cases, Jehovah ONLY answered the prayers for selfish and nefarious reasons!
This does nothing to bolster one's confidence in prayers for personal needs. None of the examples in that Puketower are for one's personal needs. There is no mention today of sexual needs being fulfilled (back then, it was to fulfill the commandment to build the nation of Israel and form the Messianic line, which is not the case today). Nothing about people having enough to eat, a place to stay that meets their needs, or even a reason to keep on living instead of just having a robot constructed to do the work the person was supposed to have been doing!
I look forward to seeing the whole series critiqued in Comments You Will Not Hear at the Watchtower Studies. Be prepared with the puke bucket, since most computer keyboards are not puke proof.