Yes getting from brain to mouth, in understandable english, at times can be a challenge.
Sometimes mouth is on auto as you are thinking of next point and something weird comes out.
Found this doing some ice hockey games late last year
Kept on saying "field" and "ball" without knowing I was saying it instead of "rink" and "puck"
There are actually 2 different things you need to have set in your mind.
1) Memorize numbers
Once teams announced Thursday I usually break the 23 into their groups of 10
ie all players 1-9, 10-19, 20-29, 60-69 for Crows etc then work through each group until entire 23 is done.
First few rounds are always a challenge but if you have called a team once learning 4-6 new numbers per side is a lot easier than 10-12
For me I always ensure if nothing else the number are memorized before each game. Sometimes someone else gives me a flash test, especially before a big game or one where the teams / players are new.
At ground will usually read down the Budget order with names covered over for a final run through just before air time
Often when team runs out (broadcast permitting) I will have another look just so head is in right space, plus I often call in my own head early in game when other commentator has call for first 5-10 mins until I feel I am in the groove needed.
2) ID a player without a number
I was spoilt starting my announcing career doing Gridiron, numbers everywhere, cant miss. SANFL not so lucky.
Guys like Phil Aspinall, John Nankivell, Chris Kendall and Don Cooper are awesome at this, I need a bit of help at times.
Always looking for something that makes them stand out ... ie hair style, boot colours, long sleeves, taping etc
3/4 time of Reserves is usually a good chance to get some idea especially for teams that have training jumpers with numbers on the back.
Then as above re watching pregame.
This all before we get to any research on backgrounds, stats etc ....