You are not missing anything.
Those are the two ways to measure powder. First (easiest) suggestion, use the scoop and weigh the what the volume is. Keep your stroke even and do the same thing every time. (Do not vibrate, tap or push down the dome off powder on top, I use a popsicle stick to brush it aside. Most people put powder and a smaller container, like a tea or coffee cup. NO SMOKEING!
If that is what you want or at least close to it, start loading.
I started with the Lee Loader Kit for 303 British and found that consistency is the key to good ammo!
The next cheapest route is to trickle some powder and weigh each charge. Can be extremely accurate & extremely time consuming. You should have a tiny bowl and a funnel to help with this. I load all my 1000 yard target ammo this way!
Next is the $100,000 question: Do You want a powder measure? (I think you do.) Which one? The truth you will only get what you pay for! Lee Powder measurers are famous for being inaccurate, and temperamental! (I have stayed away and never used one of that brand) Over the last 44 years I keep coming back to the tried-and-true Lyman 55. Based on a design over 115 years ago, it works and keeps working. Lyman has discontinued these, but New old stock is still around there is a replacement product too or find one at a gun show. I am currently using a Black Powder variant, (cost more & holds more) I have had several others RCBS, Hornady and others The have fixed chamber and adjustable chamber designs, I believe you get the best use from adjustable systems (cost more, don't have to buy additional chambers for different loads)
Some people go for automated digital powder scale/dispensers, some are powder type sensitive, all cost big money, all are relatively slow!
That is the quick and dirty.
The most important things are: 1) SAFETY<SAFETY<SAFETY! ,2) Have fun, 3) Load lots/shoot lots!
Ivan