Hi, well, I humbly submit my opinion and that is that if you want to have an anointed P/W session then you have to be yielded to the Holy Spirit because it is He who brings the anointing. You prepare yourself throughout the week by praying and reading the scriptures. You ask the Holy Spirit to guide you in the song selections and believe me, He will coordinate what you will sing so that it will help prepare the hearts to receive God's Word. The anointing is not a feeling or an emotion that can be turned on/off but rather it is the power of God released on our lives to destroy the yoke of bondage.
If you have any more questions, feel free to ask.
Be blessed,
Maria Jones