My biggest thing is always do your research to expand your business plan (if you don't have one, I would suggest you make one) and go over the details, how your going to market, what you expect to see in return, what is the ROI and if you aren't seeing things move in the direction that your research was leading you think you should be, don't be afraid to cut loose. Don't want to cut loose too soon, but also don't want to wait too long either.
Of course, there is always test the waters with a 3rd party that focuses on those services, gauge what interest you have, sub the work to them (although that does have concerns of it's own as well) and see if the market and how you are reaching the market justifies bigger investment into the expansion.
When doing this research, try to be as honest with yourself as you can be. While doing this isn't a sure thing that it will work out, it does help one succeed if done correctly. Sometimes good ideas go horrible if implementation is don't badly.
While today's economic time can be off putting for expansion, it can also be a good time for it as well. Just depends on how it is all done.
