First came to Thailand in 1961. Visited on business in the 1970s, worked here in the 1980s, retired here in the 1990s and stayed here ever since. Never once used an agent over all these years, and no intention of ever doing so.
Fact is Thaksin will be under threat for as long as he is in Thailand. Why, precisely, is he here I wonder ? He could so easily have continued to run things from outside Thailand.
This will be noted by potential tourists to Thailand from China, Taiwan, east Asia generally, and from around the world. The days when Thais were friendly and welcoming to foreigners are long gone.
Best not to turn up at an immigration office in that condition. They will take it as a mark of disrespect, and they will make life more than a little difficult for you.
Not entirely clear what you are worrying about, however I can only confirm that I went through the process 2 years ago via VFS with no hassle whatsoever. Calm and efficient service from VFS, taking about 1 month to complete.