ok ...
i started on this line by working in a small company (same one i'm in now actually ... maybe it's time to move on ...

, anyways ...
i went to college and worked on VAX VMS terminals as a programmer, i played a little with Solaris, but it was litterally only played with, and only from an end-user perspective. I also knew about PC's.
1st off, i knew the systems that i had played with very well, at least to my capacity. I knew well the user end of VMS, the editors, the scripting, the general command set.
My programming skills were good, probably the best ADA programmer there at the time, and we had been given a course in c++, but to be perfectly honest it was really 'retraining ADA in C++' ... but as i said my ADA skills were high.
I was lucky, i went for an interview, i had programming experience (summer job that went on to be a year out), and met an interviewer that was of a similar nature to me ... they had VMS machines on site, used Unix boxes for programming, and had a fair number of MS machines.
he had had a bad week, the agency had sent a lots of useless people to see him, he was over-worked, on a deadline, and they had sent him another candidate to interview ...
the big difference was that when i said i knew something i knew it, i didn't say i knew 'how to program a super computer' then turn out to have worked on a unix machine at college, typing in exactly what someone else had told me.
when i said i'd programmed on VAX VMS, i had, when i said that i didn't know Databasing hands on, but i'd studied it at college, i was telling the truth.
yes they offered me lower than i wanted, yes they put in a clause to improve it if i passed my 'trial' period, yes i've been here 4 years ... yes my salary has improved significantly (especially when i had a kid, and they realised that i needed the money or would walk

. but at the time i was out of work, just got married, and running out of funds quickly
since i've been here, i have become the first port of call for problems, yes that has it's downsides, but it has made me _INDISPENSIBLE_
my knowledge of the systems is now greater than my bosses in lots of areas, and i've been moving our system administration slowly into those areas
4 years system admin is not much, but i did a lot of work in learning the environments before i went into it. not the general admin, just the look and feel.
it worked for me.
on the other hand i know people that have gone into interviews with big companies, lied about what they know, and got much better jobs than me, knowing that there is always a 'break-in' period for any new job, in which they can learn what it was they were employed for
Jon