Can a Christian ignore Jesus's commands and expect that to be just fine?

The Israelites could not ignore this matter of dress and treat it lightly. ... Jesus Christ, for example, pointed out that a deliberate rebellion against any of the commands would prevent one from inheriting God’s kingdom.

If he repents he'll be just fine.

Yes, they can. For example, most Xians don't go around killing fruit trees when they don't bear fruit out of season, and that's a good thing. Jesus was a real douche back then.

Yep. Catholic priests do it all the time, without any fear of going to "hell".