The situation to avoid is where the only out you have is to descend
into unknown ceilings and a chance of icing. You have ice, can't climb
above it and can barely hold altitude. That is the ultimate nightmare.
You ice up, can't climb and are forced to descend into unknown
terrain/ceilings. Definitely DON'T do that.

The only situation that is deemed to be even slightly "ok" is to
descend from VMC down through a possible icing layer 1000' thick on
approach where you have weather report and know you can land, where
they are saying "light rime". That might be ok. People do it and get
away with it.

My experience with ice is you can't really predict it. If it's below
freezing and you are in a cloud or it's raining or snowing, you will
probably get it. And without a known ice airplane, you will NOT WANT TO
BE THERE!! Now if you have 7000' of VMC below you and the ground is 70
degrees F and you're up at 11,000' and you fly into a dark cloud and
get a LOAD of ice, you'll probably survive and live to fly another day.
From that experience you take the knowledge that you don't want to do
THAT again. Personally I think it's too risky to get any ice in small
non-deiced GA airplanes. They just don't do well.

So don't go if you think there is ice. You will probably get it some
day and probably survive. But don't push your luck, because if you get
it, you are flying on luck, which is not a good idea at all.