You have to understand that when the Buddha talked about the Middle Way he was talking about extreme asceticism and sensual indulgence. He wasn't talking about the "upper" middle way in the sense of when a lot of people talk about the middle way, they are considering their life and their pleasures and are wishing not to give up these pleasures. I don't think any of you are into extreme asceticism. So it probably isn't going to hurt you too much if you add a little bit more renunciation into your life.
As far as finding the middle way for your life, from my understanding of renunciation, compassion is the key to renunciation. Compassion and wisdom. When we investigate some of our desires, we may start to see that some of them bring suffering for ourselves or others. So as we begin to understand and see the Dukkha, it's much easier to let go of some of the things that we consider pleasurable in our life. For example, some people may have difficulties giving up cigarettes. One of our smoking techniques is to consider not only ourselves and our health, but also how our smoking affects others and how those cigarettes come to you and the suffering involved in that. So as we increase our awareness of compassion, renunciation becomes easier.
If we are doing renunciation just to feel a bit better about ourselves, then there may be a bit of force in that renunciation and it may not feel that good. So if we can increase the power of our confidence, then renunciation becomes easier. If we can increase spiritual joy in our life through confidence inspiring objects, then also renunciation becomes easier.