How do I feel I am fulfilling that role?

Though I feel completely competent and willing to do all these things I am finding the lack of time extremely daunting. There are times when I am asked to do too much immediately and though the teachers accept the best that I can offer, I feel in myself that this is not enough. First thing in the morning is particularly difficult, because I only have a limited time to switch all the computers on and install the programs requested. There are times when supporting the teachers in the classrooms takes almost all of the time, and I then have little or no time to settle down to my own set of jobs. If I have the odd half hour, or fifteen minutes then I sometimes flounder, because I have forgotten what I need to do next.