There are three reasons you want to offer a money back
guarantee.  First, it’s more powerful
than a free trial, because “free” implies no value.  Second, it gets at
least a partial commitment from the employer because it forces them to put you
on payroll, or at least start the process, and a rolling stone
gathers momentum!.  Third, “free trials” for employers come with
an implied risk that if you get hurt on the job – even though it was a free
trial – the employer may be liable. 
Frankly I think this is an urban myth but some employers believe it.

Keep the money back guarantee to a reasonable period –
perhaps 1-2 weeks.

Make sure the work is something you really want to do
or your heart won’t be in it, which defeats the whole propose

Ask for frequent feedback

Make sure you don’t need to invest in any special tools
or clothing that you
won’t use again if they decide to take you up on your money back guarantee.

Don’t do this in the retail or food service industry
around the holidays because you likely will not be kept on.

Compliments
of David Perry and Kevin Donlin

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