your plan sounds really good and it probably is a good idea to keep your old job, at least until you can see some serious financial results. From your explanation it sounds like you are not fully aware of how much work there is behind a weekend wedding. It is a mistake many people make, the one to underestimate the workload of a wedding; even professional photographers often get overbooked, simply because they tend to think that it's only a weekend.
Well, there is much more to it, beginning with the fact that all of these pictures need a lot of attention and in my experience a wedding easily keeps a person busy for about 70 hours all included.
Editing the images in photoshop takes time and if you don't do any editing... something is not going to look right.
I am never able to deliver the final work before a month after the wedding, some time even longer, so make sure you understand it is NOT just a Saturday. You can read more about it in this article I wrote on the issue: http://www.misposo.com/How-to-Choose/Ch ... ographers/
Hope this help and wish you all the best in this fascinating career.