Starting with calculus, Spivak and Apostol are considered challenging for beginners, and many recommend against using them as first texts. Instead, Lang's "A First Course in Calculus" is suggested as a more accessible introduction that maintains rigor while avoiding complex concepts like epsilon-delta definitions. Cruse and Granberg's "Lectures on Freshman Calculus" is also mentioned for its motivational approach. It's advised to explore multiple texts simultaneously to gain diverse perspectives on calculus. While Strang's book is praised for its conceptual clarity, it lacks depth in proofs and theory. Apostol's two-volume set is noted for its comprehensive coverage, including linear algebra, but starts with integration before differentiation, which may be unconventional for some learners. Overall, using a combination of resources, including revisiting Spivak and Apostol later, is encouraged for a well-rounded understanding.