We explore 1) the spirit of metta practice;
2) some of the challenges of the practice, particularly framed in the terms of the five "hindrances";
3) some of the fruits of the practice, as it matures.
The five hindrances are just part of the natural process of meditation practice. It's not what arises that is the issue, it's how we respond to it that is important.
The hindrances arise naturally within our practice. Developing mindfulness while the hindrances are present both brings in wisdom and transforms the underlying conditions.