I can second the recommendations already given. For a long and slow cook, it is completely fine to use a full basket. Then you use foil +/- a drip pan on the lower grate to set up your indirect zone. Obviously make sure you are using dry and good quality charcoal- but I have used at least 5 different brands of lump, and this method works just the same with all of the brands I have tried.
With a full basket, light one small area of charcoal (grapefruit sized as Dennis says) and walk away. I usually have my vents wide open, and as soon as I see the dome temp shift above 100F, I set my vents to my desired temperature. Set and forget.... never mess with or check anything ever again. Always at temp for a low and slow within 60min. Like most frequent users, I have a good sense of where 225/250/275/300/350/400F are on my top-hat in terms of degrees of turn.
In more than 3yrs of very frequent use, I have only had the fire die once. On a very windy night the charcoal seemed to burn from where I lit out to the left-hand edge, and burnt down all the charcoal in that area, seemingly with no way to get back to the rest of the bed. Truly bizarre, and a one-off.
If you're still not sure- set up a call with Dennis, he will set you right. This should be a non-issue... in fact, the absolute ease of temp management is what sets the KK apart. Like many here, I've never used a controller/ fan/ bellows- and don't see any need to.