Can you rest in the Lord, or is it only possible in books and songs?
If He commands it, it must be possible.
Several things may be assumed:
It involves faith, which means that trusting Him means not analyzing circumstances.
It means the transaction begins in prayer and is maintained by prayer.
It means obedience is supernatural and you should expect to be empowered by the Indwelling Holy Spirit.
Finally, it means you were created for this. You can rest assured that you were created to obey in the areas of God's commands and leadings.
You can not take up The Cross to follow Him if the space is already taken. Even a seemingly small bundle prevents the taking up of the Cross.
Do not be alarmed. He is able. All He asks is that you come to Him and lay it down. This happens in prayer and is the result of the decision to leave the useless and cumbersome behind and to Him.
Soldier, do not be passive about the things that bother you. They must be dealt with in prayer. When you pray in this way, you are able to recognize the open doors and the attractiveness of His way over your discomfort.
There is simply nothing else.
Look up and move on!