I have learned this at my own expense.

我从自己的教训懂得了这一点。

On great occasions I carry a big candle, bought at my own expense.

在重要的场合， 我会带一根大蜡烛， 是我自己花钱买的。

The homepage is just more trouble than it's worth and I tell you this at my own expense since the YouTube homepage is where I get most of my news from.

主页只是麻烦多于它的价值，我告诉你这个是我自费的，因为 YouTube 主页是我获取大部分新闻的地方。