you don't have to worry about the stem changes that are common in the conjugation of many irregular verbs. And since the future tense is a later development in the language, there overall are fewer irregular verbs in the future tense to be concerned with. Even some of ...
hablar in future tense conjugation hablaré, hablarás, hablará, hablaremos, hablarán how many common irregular future tense verbs are there? 10 --> decir, haber, hacer, poder, poner, querer, saber, salir, tener, venir decir diré, dirás, dirá, diremos, diréis, dirán haber habré, ...