Political opinion seems to suffer from an especially savage form of Dunning–Kruger. Often are the most steadfast and vocal in their opinions and the least objective.
Let's say for example, the economy. Maybe one party suggests lowering taxes on the "middle class" to stimulate spending and the other guy wants to make sure we don't tax the "job creators" so that they don't move overseas.
How am I supposed to know which is best? Do I need a degree in Keynesian economics or can I just listen to a few talking heads on the local news?
You're not supposed to vote for what is "best".
You are supposed to vote for what you WANT to happen.
It could be the worst thing for the country but very good for you. That's OK too, if a tad selfish.
Now, if you don't know what you want or what is good for you, you still get to decide. Anything major that will be legislated, like taxes, WILL affect you. So, what would you do if you don't know which option is the best? What you do in every similar situation in life:
a) User your direct knowledge.
b) Use your experience.
c) Try to learn for other people that know that stuff.
d) Discuss it with others in general.
e) Read up on the issue.
d) When everything fails, just your gut.
You'll have to suffer any consequences anyway.
And it's not like you can just have people with "degrees" and experts to make your opinion, or have the only right to vote on an issue.
1) For one, because those people also have biases, personal interests and hidden agendas. And even the non outright lying ones can be partisan, deluded, dogmatic, ideological or simply idiots with rich dads that bought them a good education.
2) Second, YOU'LL suffer from the consequences of any law, so it's YOUR decision to make, not theirs.