unexpected job offer

The IT field has been hopeless for me that I have switched
to office clerical for two years after having had a few
low-end desktop support jobs. The past few weeks I've been
looking for a new job again and one hiring manager said he
liked my computer background and said he'll give me a
network admin job if I want it.

He knows if he post a IT job ad, he'll get tons of resumes
and it's hard for him to pick a good one. He has gone
through with a few candidates before and they didn't work
out. So while I told him what I did in my past computer
jobs, he said I'm good to take care their IT needs.

First I am about laugh with tears that I've chased for an IT
job for years and couldn't get one. Then it comes to me
when I'm least expecting it - at a time that I feel I'm
totally done with the IT field.

I'm not the best candidate, but the manager says I'll do
fine as long as I learn them. The work is simple on a daily
basis, helping the 20-some employees with simple desktop
needs. But on the high level, it will involves network and
email system administration, company website maintenance and
security. These are big topics. I somewhat studied them to
a degree and fooled around with them a bit before. But I
lacked any serious work knowledge in them. I have some time
to study and learn them. But in a few months, they will
expect me to take care of these things.

Two difficult situations come to my mind right away as they
can't wait. How to handle if everyone lost internet access?
How to handle if no one is getting email?

I am taking this job no matter what, but do you think I
should take this job as I lacked skills in the high-end
tasks that I mentioned? What are something I should do to
survive well in this job? Thanks Thanks Thanks.
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