jewishsoul, as always, the burden of proof is on the one making outlandish claims. In this case the outlandish claim is that handwriting analysis tells you all the deep and significant things the True Believers say it does.
First, there is no theoretical basis for the belief. I mean that in the strict scientific sense where theory means an explanation with predictive power that is so well established in evidence that it can be assumed accurate for most purposes and which gives insight into the mechanisms underlying the phenomenon.
Second, it’s been trashed and thrashed for decades by the usual skeptic crew from Martin Gardner and James Randi on. The apologists have never done, say properly designed blind studies with controls. Like most cranks they’re long on anecdote, short on evidence.
The kind of money a “professional” charges for something like this could pay for a date or two and a couple drinks poured into a relative of the girl or boy in question. That would give actual useful information like a few hours of direct experience with the person and an alcohol-loosened opinion from someone who has known the subject for his or her entire life. That’s inteligence you can actually use.