God's power is primary, ours is secondary and only is exerted in response to the Divine. He is not just endeavoring. He is not sharing salvation with man. The immediate and important effect is that the person loves righteousness and trusts in Christ for salvation. The desires are changed and the will follows.
Sin remains, but it is only struggling against an inevitable death.
Confusion must not be made between regeneration and sanctification. Regeneration is strictly God's work, in which He implants a new principle of spiritual life. It is performed by supernatural power and complete in an instant. Sanctification is a process through which the remains of sin in the outward life are gradually removed. Perfect righteousness is our life's goal, but it is not obtained until death.