It can take a while.
Thankfully, there’s already somebody out there who’s as obsessive about pens as you are destined to be. You’ll find him here. Not only does this guy product-test and review a plethora of pens, he also provides you with a large image of a writing sample (like the one above) for each pen so you can judge for yourself.
You may find this pen-obsessive individual a little disturbing at first. Try not to be too judgemental, you’re looking at a snapshot of your future self.