Torque converter crack

Let’s say I go on eBay and buy a transmission rebuild kit.

I saw this for $129
I’ve never been inside one of these but have a pretty good understanding as to how it’s built and operates.

I know if I don’t I’m going to run Into more problems fairly soon as far as the clutch packs go.

Is this something that requires a lot of special tools and a lot of extra parts. ......or is it something that is pretty straight forward.
Are there any specific things or special info that goes into them?

Should I even take the valve body apart?
What might be worn out besides clutch packs?
Is my input shaft even good enough to mess with this transmission? It’s scored some in that spot but it doesn’t look the the converter even sits on that. Looks more like it sits on the splines and bushing.

Will that kit take care of everything?
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Just looking to have to not do this twice. I’ve seen YouTube videos and they make the whole thing look very simple but that doesn’t mean it is.