That's just it, you don't.
Aristotle, at the beginning of the Nicomachean Ethics, observes that moral action doesn't arise from deliberation. In order to think clearly about virtue, one must first already have a virtuous disposition formed by good habits. Aristotle drily remarks that the endless ethical debate of some philosophers is really just a sophisticated way of doing nothing. You become virtuous -- and thus able to understand virtue -- by acting virtuously. Nobody ever reasoned their way into right living.
Same is true for discipleship.
You can follow Jesus at a distance, but it still takes following. There's no detached place from which to objectively judge the truthful veracity of Jesus' claims or the claims we Christians make about Jesus. It's an Enlightenment lie to believe there is such a view.
The earliest Christians knew this.
In one of my favorite texts from the Church Fathers, Clement of Alexandria's second-century Exhortation to the Greeks has a similar view of the priority of acting over deliberating. Clement's Hellenistic friends don't first need to comprehend all the complexities of the Christian faith. What they need first of all is a change of disposition. They need to be charmed by the magic of Christ, enchanted by Christ's music. The first step is to accept Christ and to begin to follow his way. Understanding what it's all about comes later.
Then Clement offers one of the most impressive comparisons: Following Jesus is a lot like getting drunk at a party:
Let me give you an illustration. You might have some doubt about whether it's right for a person to get drunk. But it's your practice to get drunk before considering the question. Or in the case of self-indulgence, you don't first make a careful examination: you hurry to indulge. Only when divine things are in question do you first inquire. When it's a question of following this wise God and his Christ, you think this calls for deliberation and reflection, even though you have no idea what would be pleasing to God. Put faith in us, just as you do in drunkenness, that you may become sober! Put faith in us, just as you do in self-indulgence, that you may live! (Exhortation to the Greeks 10.77)That's not to say that the Christian faith is irrational -- there's good reason for me to title my book on theology, Faith Thinking. For the one who's had this change of disposition, Christ begins to shine as the rational light of the universe. (Think Colossians 1 here.) Clement in another place ensures his readers that he has "an abundance of persuasive arguments about the Logos". But those arguments are for folks who've already had their desire awakened and already begun to "contemplate this clear faith in the virtues".
If you start following Jesus, it starts making sense. So the first thing you should do is pray and love. The reasoning will come in time.