I appreciate your commentary about being a doer. This goes hand in hand with the concept of the terms of the covenant. There were terms to the Old Testament Covenants and there are terms to the New Covenant. The New Covenant is a covenant between God and Man. It was specifically a covenant made between God and Jesus. We get legally into the Covenant by abiding by the terms of the covenant.
Example:
1 John 5:13 (KJV)
These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.
The first term of the Covenant is to believe on the holder or progenitor of the Covenant - Jesus.
Another term would be:
John 3:5 (NASB)
Jesus answered, "Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter into the kingdom of God.
Another:
Matthew 6:14-15 (NASB)
"For if you forgive men for their transgressions, your heavenly Father will also forgive you. [15] "But if you do not forgive men, then your Father will not forgive your transgressions.
So, in my mind to be a doer is first of all to keep the terms of the Covenant. The New Testament is conditional just like all of the other covenants. Someday I want to read the NT and write down all of the terms of the covenant. I don't think there are too may.
These are not necessarily rules to keep like the law, but rather spiritual conditions, which are required to be met. I usually get into conflict when I mention this because people often see this as "earning" their salvation by works and they insist that salvation is free with nothing required. I don't think so.
Can you think of any more terms essential to the New Covenant?