Of course professionally it is done by laying, or even microarraying and I once heard of a type of misting (although seems lossy as hell), but point is: unless you can do at least a little stack of compressed layers of paper at once, the thickness (or rather thinness) can make the process very impractical.
It also depends on the quality and absorbancy of your paper. Not only does it determine how much it can contain (nice and thick/porous making it fluffy), but also how well liquid blots in it without pooling. It is extremely important how well the paper responds if you apply the liquid because the process of absorbing is never perfect. The less perfect it is, the more messed up the result gets from the simple fact that that your 'syringe' or container or whathaveyou applies the liquid from one point which then has to spread in the paper rather than on it. Not every paper, not even every blotter paper is up to it to fit the nooks and crannies properly without the messiness of leaving parts open and other parts soggy. As said you minimize this by stacking, creating extra dimension for blotting.
I've done the pipetting more easily, which conversely is appropriate for single layer application, in my case with a GC/MS micropipet. Yes this is also imperfect, not that professional, but IME it had advantages. Depends much less on the paper, your skill and the luck to get the blot even, but just on finesse with the pipet. And the error margin is much more spread as you dose each hit, and especially when you do a few iterations.
Realize that both techniques can be practised with colored solvent, compared even.. before you feel confident to proceed, so I personally would not gamble on it but try. (And curious as I was I did though not with LSD).
Years before that, I'm not sure if it was because at the time I lacked ethanol for volumetric measurement if the phenazepam that became a thing (maybe bad reason since there is always vodka but not sure if it would work), I used a less micro pipet - but a syringe, stacked joint rolling papers on which I dropped a solution and a whole lot of patience as my first even more amateur blotters - although those were dropped separately and eventually put into capsules so there is no bleeding into neighboring squares. I liked to experiment anyway those days, techniques pretty much worked out well.
