Just make sure to master TI-BASIC before using xLIB, though. Not necessarily master like Weregoose, but know how every command in the PRGM menu works and the basic optimizing tricks. You can go straight from BASIC to Axe afterward, since xLIB is harder to use (not as in hard to learn, but more that the syntax is near impossible to memorize so you always end up opening the readme every 3 minute when using real(1 or 2.)