Thai Non-B visa in Phnom Penh - agent recommendations?

Hello all!

I'm taking a bus to Phnom Penh today and hope to start my visa application process in the morning. Do you lovely folks recommend an agent of some kind who can deal with the infamously tricky consulate there?

I've prepared myself for the turn around time and potential extra cost but I'm otherwise a bit oblivious to the whole process. I'd like to save myself the anxiety of doing this myself if I can find someone reputable!

Thank you for your time and response(s)!

P.S. I'd also love any tips and tricks you have to make the process easier. 🙂