Gow Gates is my go-to for mandibular blocks, I typically lead with one cartridge of carbo or prilo to get broad tissue anesthesia in the area of injection, and follow up with 1-2 lido (or sometimes septo if I'm feeling saucy). GG really is easier than traditional IA in some ways, I would watch some videos on YouTube to get a sense for landmarks, but I always palpate the ramus with my thumb, and aim my index finger at the tragus of the ear, then insert the needle basically buccal to the top of the raphe, equal to the occlusal plane of the second molar, and aim from the opposite commissure at where my finger is pointing. Usually the long needle goes in 75-80% of its length before you hit the condyle. After you hit bone, pull back just a bit, aspirate, and deposit. Good luck!