The smart move is to install your eSIM at home, while you still have your normal internet. Buy the plan, get the email, and follow the install steps over your home Wi Fi. You do not turn the data on yet. You just load it onto your phone so it is ready and waiting.
Doing this early matters. Guinea makes you register a local SIM card with your passport and a photo, and the process is slow. With an eSIM you skip all of that. By the time you board, your phone already knows how to get online in Guinea.