关于 形式主语it

关于 形式主语it
形式主语后做真主语的不定式能不能有两个?
It is difficult for me to get along well with others and to take care of myself independently.
不对的话应该怎么写?
还有,后面那个不定式的to什么情况下能省?
并列的不定式后面那个都可以省to,还是只是在一定情况下能省略?哪些情况?