yes, they are all quite heavy!

Its two aspects, having to press on the fretboard (individual notes or chords like with 'bar chords'), and also strumming if not using a pick. Your hands will get used to them over time either way, but lighter is better to start because it takes time to build muscle and callous. But really even if you start with lighter, and later try heavier, you'll have built up the required hands to not find the heavier ones too difficult. But if starting with heavy, to the point where you can't even comfortably press hard enough for long enough to get a note to sound, then its too heavy and you should start lighter, if that makes sense. You'd get too frustrated if you had to put too much effort into pressing a string, it'd slow everything down.

edit: I should add, that for me my occupation helped a lot since I use my hands a lot, but from your other comment, I'd expect a computer based occupation would give the dexterity & speed, with some adaptation, but the muscle development required would possibly be different. There are finger strengthening exercices that would help (you can find online), or I'd expect another simultaenous hobby that requires you to use your hands would also build that. If the strings are difficult to press to the point of it getting in the way of learning either go lighter, do exercises, or (as elsewhere) nylon strings are easier.