My TWH is about 10 years old, trail ridden and used to a snaffle. I would prefer to go bitless with him partly because of my inexperience. I know being soft with my hands and having "feel" comes with time. I hate the thought of hurting him while I'm trying to learn. Another reason is simply because he's so soft and responsive now on the ground. I don't think you'll ever find another more even tempered, sweet natured, laid-back horse anywhere.
If you suspect I'm not a fan, you're right.
A green rider needs instruction and coaching. The consequence of not getting that is a sore backed, sour horse and a very frustrated rider. A "sweet" equine disposition can quickly "go south" if the rider doesn't know what they are about.
Find a good, solid, classical equitation instructor. Start on a trotter. You will develop better hands, balance, and feel. After a year or so on the trotter you'll be ready to move to the more demanding gaited horse.