When I first got into home brewing, I looked at BeerSmith and a few other similar class of software tools and I too found them just too overwhelming for my skill level. I went with a simple, but good beer recipe database application (SUDS) instead. It has no recipe design capabilities, but was a handy way to organize and track my brewing efforts.
Years later, with much more brewing experience, I made the move to BeerSmith and have been very happy with it. It is a great design tool, but definitely intended for those with intermediate to advanced brewing skill. Before you delve too far into creating your own recipes, my suggestion is to use BeerSmith for brewing a few existing recipes. Just enter them into BeerSmith and brew as directed. This will give you the chance to use the features of the app and see how ingredients effect the recipe. Then, take an existing recipe or three and use them as a template for creating your own (rather than starting entirely from scratch). You can tweak individual ingredients of the recipe and see how they effect the characteristics of the brew. I especially like the graphs in BeerSmith which show the characteristics of your recipe versus a given style profile. I think tweaking a few existing recipes is a good way to learn BeerSmith and to learn how to design your own recipes.
Also, pick up a copy of "Designing Great Beers" by Daniels. This is a great reference, which can help build your knowledge of beer styles and recipe designs. This knowledge will go a long way to making BeerSmith more comprehensible and useful to you.