Where would I find the float on the dishwasher and what will it look like?

According to a how to manual on the internet this float controls the water
and stops the machine over filling. ( if machine over fills the water comes
out in a flood at the bottom apparently - like mine does).

It supposed to be easily found and can be cleaned or tapped with a
screwdriver to free it. I have four things sat in the bottom of my
dishwasher a pointed cone shape thing, the shower heard thing , the salt
thing, and the drain thing

Also where would I find the intake valve? Apparently that can also fail to
shut off and cause the dishwasher to overfill.

Given HE has stated he things the float is the most likely cause and
because its s*ds law HE probably knows, how easy are they to repair if
they dont work?
( what I want to know is am I likely to be waiting yet another week for a
repair man to return with the right bit?)