Question about online appointment for changing the visa.

I got an online appointment to submit my documents tomorrow at 1130. But from what I have read in some groups and google reviews, people said it's their breaktime and staffs don't work during that period. And I saw some reviews saying to get to the Division 1 around 0700 in the morning. Am I safe with my online appointment and can go to the office just before 1130 (the given time) or do I still have to get there at 0700 in the morning for a long queue? This is going to be my first time doing visa stuffs in Thailand. I will be so grateful for your tips and suggestions. Thank you so much :))

It is my first time getting a tourist visa ever in Vientiane, and I just read the fine print disclaimer of the email they sent me, with my confirmation and number appointment, and it says to dress appropriately and that you must not wear tank tops or have bare feet.

So I have a few questions which are:

1 - flip flops okay for shoes?

2 - do I need to buy a t’shirt before my appointment tomorrow? (Did not bring any clothes with me that cover my shoulders or have covered shoes!)

3 - my queue number is 130 do people recommend getting there early when they open or later around 9.30?; and

4 - can you photocopy your passport there at the embassy. I have my photos ready and other documents printed if they ask, just no copies of my passport. I read that you can photocopy there, and can pay in baht for it.

Thank you 🙏