Hi and welcome!
I'm another single Mom, having recently brought my son home from Guatemala. I felt like my agency was completely comfortable working with me as a single person. I found no difficulty at all. My agency, like a host of other agencies, works with numerous single clients. I think that being single doesn't work against you on the US side of the adoption process, but could work against you on the Guatemalan side. I'm not sure that every PGN reviewer views single-parent adoptions favorably. Moreover, there is a risk that the Guatemalan Congress could pass a law like the Ortega Law, which, among other things, would have banned singles from adopting. Those in the know say that even if such a law were to be adopted, it would be challenged as unconstitutional. As I understand it, the Guatemalan Constitution, like our own, prohibits discrimination on the basis of marital status.
Hope this helps and much luck with your journey!!! It's quite a ride!
For me, as challenging as the adoption process itself was, I think it's even more challenging to actually be a single parent. It's wonderful, rewarding, fulfilling and all of that good stuff, but also tiring, sometimes frustrating, and difficult. Did I mention tiring?? At least, that's been my experience thus far. Granted, I'm a newbie at this and I've been told that it gets easier with time!