Help installing threshold

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> Hi,
> Just looking for a few words of wisdom installed a new threshold in
> place of the broken one seen here:
> http://i.math.drexel.edu/~pg/thresh.jpg
> (Contractor dissappeared on me with the job half done, can't find a
> replacement.)
> I know that the threshold needs to be a little above the tiles. But
> that's about all I know. Beyond that is it just a matter of mixing
> cement and creating a bed of cement underneath it of just the right
> height and putting the threshold on top of it and letting it set?
> I would appreciate any advice and/or useful links!
>
> Many thanks in advance!
>
> Aaron Fude