Why is this so hard?

We've made some adjustments in our life in the last few months and we feel they're all for the better. The biggest thing we've done is taken a long hard look at our finances and the way that we're spending our money. We also started tithing, we WANT to tithe! Thats the one check or online payment that I write out every pay period that doesn't make me sick to my stomach. I know that God will bless us ten fold and I KNOW that He will provide for us. However, does He have to cut it so close??? I am more stressed out about our money and our finances now than I was before we decided to reign things in and start really paying attention to how and where we spend our money. I know that I am supposed to trust Him and believe that He will provide, and I do, however, it's so scary right now! When I've paid all the bills and there's nothing left it freaks me out! I've done a whole lot of praying as of late on the subject of money that I probably sound like a broken record. I'm not asking to be rich, I just want enough. Thank God that the Financial Peace Seminar is starting soon at church cause I certainly need some Financial Peace!