Got my 1st interview for an IT job!

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Well as the title suggest, I have arranged an interview for this coming friday (just passed my first A+ exam too, a good week so far!) and it is my first interview in about 6 years, and also the first time I have ever had any interest from any of the 100s of IT jobs I have applied for! It is basically a 1st line / helpdesk role, pretty decent money I think, but this obviously could be the break I need so I don't want to screw it up...

I have been reading the pointers in the pinned thread, but would welcome any other advice, of what to expect really! Could be arguments at home too if I take the job which is giving me a lot of extra unnecessary stress but I still really want to go for it, I have been working hard for the last 18 months and to finally get an interview is a real result!!