Neat thread.
What kind of Tantra are you interested in?
I'll post two books. Both are of the "Greater Vehicle" but with vastly different dangers.
1) Chenrezig, Lord of Love:
https://www.amazon.com/Chenrezig-Lord-Love-Principles-Meditation/dp/0963037102
Chenrezig is the most merciful, benevolent and safe tantra practice one can take on their own. And quite frankly, due to corruption of the temples, the safest route is doing it on your own.
2) The New Guide to Dakini Land: The Highest Yoga Tantra Practice of Buddha Vajrayogini -
https://www.amazon.com/New-Guide-Dakini-Land-Vajrayogini/dp/1906665494
Chenrezig is the safest, Vajrayogini is quite dangerous though, so I wouldn't recommend her practice without a master. Though, like I said above, the temples are corrupt, be cautious.
There are other tantric methods I know of, but those involve the left hand path, a road that leads to the brightest of stars, then the deepest of hells.