First of all, remember no one is irreplaceable. If they quit tomorrow, got hit by a bus, whatever, the business will survive. It survived before this employee, it’ll survive long after this employee is gone. I ALWAYS implement ‘desk top procedures’ (different than auditable SOP’s) whether in the office or on the production floor, so someone that’s never done that job can come in and do it with no prior knowledge. Couple that with cross training, and the gap should always be covered. But that’s up to the manager/business to do. Beyond that, Without knowing the exact situation...difficult to navigate, but I’ll usually have a sit down with them, reiterate the direction I’m going and I’d rather take them with the business. Like I said above, 50% of the time, that seems to straighten people out. If they’re just not capable of doing the job, bad hires happen, (or just not getting with the program) that’ll result in another sit down where I’ll put the employee on a performance/personal improvement plan. In short, over X period of time, up your game, let’s get you the training you need, and hit the appropriate milestones. And it’s also an opportunity to identify if the role is just a bad fit for an otherwise decent/good employee that could be an asset elsewhere. If all that fails, you gotta do what you gotta do. But remember, always have a contingency, you’ll probably piss off this employee, so be recruiting for their replacement and you’ll have to redistribute the work until you find the right person. Or like I said above, if you already have capable heads, promote internally. Daisy chain your way down to the easiest filled position, or when the qualified heads run out...then fill that role externally.
Now obviously if negligence or insubordination is the issue, don’t let the door hit ya, where the good lord split ya.