Indeed…the point isnt for it to tell you exactly what to do, but for you to go forth and with the knowledge you do have, research how to do the things you dont know using the example as a guide. FCC emphasizes Read, Search, Ask and this is where you start working on your reading, searching and asking skills.
Now I do think it would be beneficial to make that even more clear in the beginning. Like, as you get further into the challenges, it will offer links you may find useful to help solve a challenge. Doing the same thing with this first project and offering a link to the Bootstrap documentation would help make it clear that the hand holding is over, time to do this on your own.
And you totally can…no doubt, just that if you know you are now expected to learn how to research to put your site together, it puts you in a different frame of mind than feeling like youe been dropped off and expected to now know it all…which isnt the case at all.