You may have quite strong feelings about trying to make money from your blog, it's common for some people to think it might be evil, lame or obnoxious then the best thing to do is not commercialise it at all.
But if monetizing your blog doesn't offend your sensibilities then go for it or if you think otherwise and you consider it evil, that's fine too.
But you have to be absolutely clear in your mind that you want to do it before you even begin, because attempting to generate earnings from your blog is hard enough without cold feet getting in the way and holding you back.
It ought to feel good making money from your blog, there's nothing wrong about having a healthy need to succeed.
If in your opinion your blog has real value then earning income from it should be no more than you deserve.
There's no way you can be in any way timid about the whole idea though, if you put ads on there, really put those ads in there it has to be the same if you're putting in requests for donations, do not be shy.
Some people might complain, they always do when you commercialise a free site.
But can you make a decent living online? Without a doubt. It will take longer if you have a day job but the opportunities exist.