I've done several submissions to NGC albeit mostly at shows (to save the postage and so the rep can check it first). It really is simple... after you get your submitters number.
Go through you coins and figure out what you want to submit.
Make a list. Make sure everything is eligible for the same service - if you have one $5000 coin (nice to be you), you can't submit it with a bunch of $200 coins on Economy service. You just need to do multiple invoices but you can ship them all together.
Go to the NGC site and click to the collector's society part and to the on-line submission application. Fill it out until you get to the part where it asks you to list your coins.
Flip over to notepad or something like that and make a page to print labels.
nnnnnnn-001
1932S
Lincoln Wheat cent2015.032
(where nnnnnnn is the NGC invoice# and the 2015.032 is my catalog # (NGC ignores it))
Print out the page, cut out the labels to fit in your 2x2 (small coins) or 2.5x2.5 (larger) (if you have even one larger coin - half or Morgan/Peace) use only 2.5x2.5s.
Now one by one, I enter the data in the NGC invoice
Put the paper label in one side of the flip
Removing the coin from current protective casing and place it carefully into the flip
put flip aside in sequence
repeat
When all are done, click through to the next page of the wizard and review everything line by line. ESPECIALLY checkboxes for variety plus, etc.
Keep going all the way to the final printing (credit card #, etc.).
Use a rubber band to hold the stack of flips together (not too tight or you risk bending thin coins, but not so loosely that they will fall out). Then take the 3 copies for NGC you printed and rubberband them around the stack (again not too tightly).
Put in a box, use peanuts or similar to protect, mail (with insurance and signature confirmation)
and wait
wait
wait
In a couple days you'll get confirmation and then a day or two later you will see your invoice on the NGC site with the "received" notation.
wait
wait
create a browser shortcut
wait
promise yourself you will check only every couple days
realize you are lying
check AM (in case it was updated overnight)
check PM (in case it was updated during the day)
wait
drag browser shortcut to the desktop to save the extra two clicks
wait
wait
wait
What do you mean browser that this is my favorite link of all time?
wait
wait
wait
keep watching as the status moves
wait
wait
WOW - grade posted... view them... really? Yes! Groan! No way! Yes!
wait for USPS
wait
wait
wait
They'll be here tomorrow
Drat I will be at work
Get the delivery notice
wait until Saturday
go to PO to pick up - OMG what a line...
wait
Give slip to clerk
wait
wait
We can't find it... oh, it's registered, it's in the vault - have to find the postmaster - he has the key
wait
Get box
Run out of PO
Moral dilemma: Do I open it in the car? Or --- guess the word --- WAIT until I get home.
Told you it was simple...
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/