1) A consecrated pentagram will not harm you when you wear it lying down. Inversion is an issue when placing pentagrams in doorways, because it is in a stationary place and will be visible to entities who seek to enter your home.
2)
The Pistis Sophia Unveiled: Chapter 1 and
How to Charge Talismans and Cleanse Our Sanctuaries.
3) Yes, utilize the four exorcisms:
Ceremonial Procedures of High Magic
4) Concentrate and mentally invoke the five helpers: Gabriel, Raphael, Uriel, Michael, and Samael, when blowing each breath. Other than that, you've got it!
5) A few seconds is fine. The important thing is your concentration, invocation, sincerity, prayer, and remembrance of your Being.
6) Yes, pronounce Aleph and Tau (or Tav), the first and last letters of the Kabbalistic Alphabet, the Alpha and Omega of Christ:
Alpha and Omega
7) Whoever is willing to practice should not be restricted if sincerely working upon themselves.