First of all, you should make it clear that calligraphy and signature are two different concepts, which are related and different. Simply put, calligraphy is to write every word well, and only two or three words are needed to sign at most four words. Calligraphy should follow certain rules, while signature pays more attention to artistry and recognition; Calligraphy is writing, and signature is three-point writing and seven-point painting. From this point of view, drawing your signature well does not necessarily require a high calligraphy foundation, but it is easier to draw with a calligraphy foundation, so friends without a calligraphy foundation need not be afraid of difficulties.

As for the "simplest learning method" you said, it is to describe and copy. Description is to print out the signature designed by the designer for you, put it under the glass plate and draw it with strokes; Copying is to follow the picture after the description is mature. It should take less than an hour or two to practice a signature. But in order to master it skillfully, don't ignore the usual practice. I hope my answer is helpful to you, and I wish you success!