Obviously there are a lot of boxes, and it may look daunting, but it does help that they are grouped together into parties, so it doesn't take that long if you want to just number them top to bottom on a party-by-party basis. The independents are likewise grouped together, so if you do a little bit of research before the day you should be able to figure out which groups of independents are worth voting for and which are complete raving loonies [seriously, why the fuck would an anarchist run for government?].
If you're worried about making a mistake, it's worth noting that if you vote both below the line and above, the below the line vote takes precedence. That means if you put a 1 above the line for the party you most support and then screw up your below the line vote, the above the line vote still counts, but if you vote properly below the line then the below the line vote will count. I'm sure that's clear as mud, but the upshot is: voting below the line and above the line gives you the best chance of making sure your vote counts.
If you really don't want to vote below the line, please at least take the time to check out the group voting ticket for your party of choice, so at least you are aware of where they will direct your preference if you vote for them above the line. Or check out this post by aeduna for a decent overview and some idea of what each group of independents are about (Victoria only).
It's hard not to sound patronising when talking about this stuff, but it's your vote, damn it, don't let the parties fuck it up for you.
You're perfectly capable of doing that yourself.