Be careful when you read this because the two essentials are not “reckon yourselves dead to sin and alive to God in Christ Jesus” (Rom. 6.11 Darby).

Rather, that was the first essential. The second essential is as follows:

Second, “neither yield your members instruments of unrighteousness to sin, but yield yourselves to God as alive from among the dead and your members instruments of righteousness to God” (Rom. 6.13 Darby).

The first essential is trusting you are dead and alive in Christ. Believe it. Know it.
The second essential is experiential as a consequence to the first essential: don't yield your members to sin, but yield to God and your members to righteousness INSTRUMENTS of God.

Wow! We often overlook the intricacy of Scripture because we don't read carefully enough.