Misting plants only raises the humidity level while you are misting. The only thing you will manage to do is ruin your funiture.
The fronds do look a little yellow so some fertilizer would help. The oldest fronds wll yellow and die but the plant will continue to grow new fronds.
Your Boston Fern will quickly out grow its pot but you can keep it manageable by pullng it out of the pot and cutting the plant into smaller pieces. Plant up one and give the rest away.
