Hubba

If you dont have a wristband just touch something that is grounded from time to time(not 100% safe but I never fucked up like this, no guarante tho)
do not touch any contacts ever! VGA,CPU,RAM,and almost all components are operating in the 1-2 digit Volt range an ESD has arround 1-3 THOUSAND Volts
do not let the socket of your cpu open too long
do not drink at the table(obvious) 
do not hesitate! no part of a pc has feet and will run away!
do not bend or scratch the mainboard when installing
do not forget the mainboard spacers
do not think: "AHH that wont happen to me!" ... IT WILL (Fuck you Murphy, RIP Organized Screws on the edge of the table)
do not wear any clothes that will charge you
do not take too much and especially not too little thermal compound (about 2-3 mm radius drop is normal)
do not let the heatsink wobble arround and install all screws like you mount a tire: diagonal (i.e.: left top > right bottom > left bottom >  right top)
use your brain its a logical progress
always think 1 ,2 or more steps ahead
nothing has to be bended to be installed
MANAGE YOUR CABLES OR SATAN HIMSELF WILL KILL YOU
unmanaged cables wont block airflow but you paid so much dont let it look like crap.
managed cables help you access anything faster after installing it
My fathers Instructor always said:"Your work will look like your Workbench!" EDIT: Complex isn't anything good in this aspect!
 
Just brainstorming...

Wellcome to the forum!
 
Up to about 20 cm the cheap ribbon cable based once are fine.
For longer connections you need impedance matched cables like the one from 3M. You can buy them at digikey.com (search for pcie riser). I use some 50 cm once and the GPU works like directly plugged into the socket. The only downside is: about 80$ per riser.

hey, Welcome to the forum!
 
yesterday i made a similar post about risers, most people say it's fine aslong you get a quality one ofcours.
so i can't really tell wich ones are good but i ordered the ''Hicom PCI-Express x16 Riser'' and il let you know how it impact the performance at all.
 
picture of the riser i ordered: 

Thanks for the answer!
Thats what i tought but the ratings on the selling sites were bad ... maybe they kinked the cable near the soldering points or are 2 dumb for a cable ...
anyways thanks for the help! if anyone else thinks he might add anything please do so every bit of information is a lot of help as i didnt use riser cables up to now
80$ for a high qualitiy 50 cm riser seems ok, not cheap at all, but ok