Overhead HELP

[Bryanluster1]

I’m looking online for tools for an overhead but it keeps bringing up crows feet. I have a 870 ISX and I’m gathering tools to do a overhead. Can someone please direct me in the right path on where to get a 19 and 13mm flare but socket? Is these the correct ones for an 870? I’ve been reading up on hammerheads tools needed and I’m trying to get these. Thanks
Also I’ve been reading up on doing the adjustments myself via Rawze’s YouTube’s and others and it seams pretty knowledgeable and I understand the doing it when the engine is not warmed up.
What kind of things can I look forward to on doing it myself and learning and NOT messing things up. ? Please help and thanks again
Ps - so far I’ve got the feeler gauges and the wrenches on amazon but I travel a lot with tools. Is the needle kind good for this because of vibration or should I get the other long handle dial kind for the 8nm?