A couple of things I’d add, really think about your gender preferences and why you have a preference for girls, I’d want to explore that to understand why girls because it can sometimes highlight unrealistic expectations about adoption.
In terms of working, most children adopted in the U.K. come with some form of additional needs. These exist on a wide spectrum, some cope well with school and childcare and some really don’t, you may need time off for professional meetings, medical appointments and therapy appointments- could you do that working full time? I’d go into the process thinking about how flexible you can be with work if need be, eg could you work part time, compressed hours etc if you needed to? I think full time work with two children and limited support would be hard going - not impossible - and your support network will change once you have children so try not to worry, but start thinking contingency planning just now just in case.