That’s a mistake most people do initially (myself included), but yeah, no. Pace yourself, because all these lessons are going to come back as reviews later.
There are several different strategies for how to determine whether you should take on any more new lessons. Myself, I try to limit # apprentice items to 100. You can also take a look at the Ganbarometer script which uses some formula based on the number of apprentice and guru items to determine whether you should take on new lessons.