What I used to do in the beginning was, once the Manor went from level 1 to level 2, I'd still renovate the level 2 rooms so they were ready for guests. In the meantime, I focused mainly on getting the girls to level up by only accepting level 1 guests until the girls were ready accommodate level 2 guests. The items from the attic and the tarot cards do help out quite a bit early on. And then when you get to level 3, you've got Amanda training your staff to help increase their skills. So you can take advantage of that as well. Traits for the girls as they go up in levels also help out tremendously.
So you've got the items from the attic, Amanda (at Manor level 3), tarot cards and staff traits (as well as office and room/facility upgrades) to help you out, too. Granted it's not often helpful for some of the more "demanding" guests (I'm mainly looking at you, Sofia..
), but once you max the girls' skills, there shouldn't be any problems. Just do it one level at a time and don't always go for the higher level guests until you have the staff skilled enough for it.
Additionally, once you get to level 3 where you have Amanda, don't focus on the guests right away. That gives you all week (Monday - Friday) to level the girls' skills up each morning. Start with the lowest level girl first and work up from there. That's what I've done. Maybe take on lower level guests on Saturdays and Sundays or do the tier events for the girls as you don't need the guests for that.