If you follow God's will, it will be done. To wish to go to heaven is precisely what God wills for you, so keeping his word and you'll be there for sure. The gate that leads to life may be narrow, but the more you yield to God, the wider it opens up for you. And when you submit yourself to him completely, it vanishes altogether. In sum, how easy your journey to God is depends entirely upon how willing you are to let him carry you.