There are some very good agents in Pattaya , dont know about anywhere else . Example Key Visa . IMO its easy to do yourself if you are confident of gathering all the necessary documentation and attaching it to the Online form for VFS . Check out their web site .
There is quite a lot of paper work to be got together and then the online form for VFS in Bangkok . That is the service the UK Gov uses to check visa applications and do the Iris and Fingerprint scans .. So I would suggest you use an agent for first time application for a 6 month tourist visa . Probably around 25 to
Teaching English in a School with a work permit is a recognised job , but teaching English to people in a Restaurant or Bar would not be allowed you dick head .