How long to swap brake booster?

[i82much]

I have a 72 K10 with factory disc/drum. I think I might have an intermittent vacuum leak in my booster - engine goes very lean sometimes and I have a hard pedal.

I might just swap in a reman booster tonight after the kids go to bed. But I plow snow with the truck and I don’t want to have it down and not able to use it because we have a storm coming.

So I’m just wondering - how easy of a job is this? Doesn’t look tough at all, but maybe I’m missing something. If there are a lot of little small parts, experience tells me I will lose one and need to order it online, only to find it on the ground a few weeks later!