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"How do I get to be in Christ so that I would have no condemnation?" According to Romans 6:11, "Likewise you also reckon yourselves to be dead indeed to sin, but alive to God in Christ Jesus our Lord." It is obtained practically through reckoning it so by faith, as this verse says.
We accept Jesus by faith as the one who saves us from our sins (Rom. 5:1). To be practically saved from its effects in our lives, we go the next step, as outlined in Romans 6. We see that as Jesus was buried and rose again, we too (our old nature) had been buried and our (new) nature is risen with Him, separate from the old nature buried below (see Rom. 6:1-10).
This is a reckoning faith in that the Bible says this process is true and ready to be put into action, and when we reckon it is so and practice it, then we enjoy its benefits.
To take this practically, when temptation arises, we surrender our mind and body to serve Christ instead of the motions of the flesh, and start serving Him (Rom. 6:11-14). With this reckoning, to use Paul's word, all the passages of "in Christ" become available to us, including the ones you seek, righteousness in Christ and no condemnation to those in Christ, Rom. 8:1.
But if we continue in the flesh and not die to it, then we will know self-condemnation or self-righteousness. Paul counted everything he formerly trusted in as loss so that he may have the righteousness of Christ (Phil. 3:8-9). He didn't think it enough to believe in Jesus for salvation once long ago. To get the righteousness that receives a reward, all his trust needed to be in Christ. He "died to sin" in that he ceased trusting in old forms of righteousness.
He had obtained positional righteousness without the law by faith alone. Now through reckoning himself dead to sin alive to God he was reaching out to practical righteousness that will be rewarded at the judgment seat. It is this latter point I am addressing in this answer, living in practical righteousness.