Good luck with that. You're going to need it. Faith that is 'alone' is not the faith that saves. A person's righteous work is the proof they have God's righteousness inside of them producing that work. In the end, no proof of God's righteousness on the outside means you don't have God's righteousness through faith in Christ on the inside.
Nobody makes themselves worthy by the works of the law. Only the giving of the Holy Spirit through faith in God can even begin to come anywhere close to producing a "stellar performance at being good" in someone.
No man can make himself righteous by working the works of the law. You don't get changed by trying to do righteous things. The only way to become righteous in God's sight is to have your unrighteousness wiped away through forgiveness, and to have God's righteousness credited to your account. That righteousness is given to you via the Holy Spirit. The Holy Spirit not only makes you legally righteous but it is also what makes you righteous in word and deed. That's why the person who is not producing works of righteousness is showing himself to not have the righteousness of God in him to produce those righteous works.
1 John 3:7-8
do not let anyone lead you astray. The one who does what is right is righteous, just as he is righteous.
8The one who does what is sinful is of the devil
That is absolutely right. But saying you have that righteousness imputed to you and then not being righteous is like saying you're wearing a white robe while standing there naked as a jail bird. This is the truth your teachers are not teaching you. Instead they are leading you astray and saying the unrighteous person also has the righteousness of God as long as they 'believe'. Not true. See 1 John 3:7-8 above.
If God's imputed righteousness is not making you righteous in your behavior then you don't have God's imputed righteousness, and you're not ready to meet Jesus when he comes back. At least even the legalist in the church has some righteous behavior to show for his faith in Christ. He just hasn't learned how to do it with joy and more consistently and effectively through the power of the Holy Spirit. But the greasy gracer is down at the saloon getting drunk and lusting after wayward women thinking his unrighteous life means nothing because salvation is not by works. Not knowing his unrighteous behavior is showing that he does not have the imputed righteousness of God in salvation.