I have successfully made mole from scratch several times, and had it turn out well (I’m from Texas, which I hope gives me some credibility in that department). I’m happy to help!
First question-- which kind of mole are you trying to make? “Mole” is just a generic name for several different types of sauce, and a mole negro, say, is going to be waaaay different from mole verde. If you don’t have any idea what I’m talking about, what you’re thinking of is probably mole poblano.
It sounds like you’re not willing to put all the effort in to make it from scratch, which is probably wise. Mole poblano requires a lot of time and effort to make. You have to toast the bread, tortillas, seeds, nuts, and spices, fry the dried peppers and let them soak, and then spend an inordinate amount of time over the stove cooking the thing. The end product is so thick that when the bubbles burst, the little droplets stick to your arm like burning tar. The times I’ve made it, it’s taken two people about two hours to make.
Unfortunately, I don’t know how to use mole paste (if I’m going to make mole, I’m going to do it from scratch.) You might try making a different kind of mole-- I think mole verde is pretty much the low end of the time investment/difficulty curve. As long as you can get tomatillos and serrano peppers, none of the ingredients are that exotic, and it only takes me half an hour to an hour to make.
If you’re going for authentic, anything from Diana Kennedy is pure gold-- she’s like the Julia Child of Mexican cuisine. The Cuisines of Mexico is the classic, but Oaxaca al Gusto covers a wide range of different types of mole.
I’ve also had great success with the cookbook Fonda San Miguel: Thirty Years of Food and Art. It’s widely regarded as the best Mexican (not Tex-Mex) restaurant in Austin, and Diana Kennedy helped with the menu and recipe planning.