1. You need any operator skin that has ghillie suit on for both SpecGru and KorTac. (I personally use Reyes S.A.Squatch on SpecGru and for KorTac I use Ghillie Monster König)
2. You need to have at least Overgrown and Overgrown 2 bundles to have both Sequoia blueprint and Violence and Timing or one of them depending on your budget. (Having both allows for custom sniper rifle loadouts with the optic and muzzle skin from either Sequoia blueprint or Violence and Timing blueprint)
3. Equip the ghillie suit operator both for SpecGru and KorTac if you want to Ghillie Suit Gamin on both sides and create your own loadout based on using grass as camouflage either using the blueprints or creating your own sniper rifle builds using the muzzle and optic skin from either Sequoia or Violence and Timing blueprints depending on what's available and remember to put on the sniper rifle and secondary camouflage that will help with blending into the grass or even bushes.
4. Stay still and don't move if you have to no quick movements do it slowly without catching enemies attention.
5. Ghillie Suit Gaming can work on every map if you know how to make it work sometimes by using the magic of illusion and prop hunt.
6. Hardcore is perfect for Ghillie Suit Gaming due to hud limitations and harder to tell difference if it's enemy or teammate including illusion methods having higher rate of successfully working.
7. If someone trash talks you because you're camping just laugh it off and keep doing what you're doing fun is what matters the most.
8. Additional information about useful equipments and perks smoke grenades and claymores are fun to use but having Tactical Camera is the best choice in my opinion due to how much information you can get by using it optimal way and gathering lots of information about enemies including setting ping on them or using it for backdoor if enemy would try to go from behind and you spot them on Tactical Camera you have the advantage. In terms of perks Extra Tactical for double smoke in case of trying to reposition or making it easier for you to defeat enemy, Battle Hardened to make sure you're not getting some of the disadvantages, Focus to make hitting shots easier by having extended hold breath duration which really helps in tough situations where it's the matter of tiny pixel atoms if you hit the shot or not, and most importantly Ghost without this perk you're basically easy to spot through minimap which makes ghillie suit gamin not gamin.
9. The most important attachments for muzzle is NILSOUND 90 SILENCER if you have both Overgrown and Overgrown 2 you're going to have 2 different muzzle skins Violence and Timing blueprint or Sequoia blueprint which is important because both of them are different and sometimes the one from Violence and Timing won't be available to be used while Sequoia will be. The optic to use is the SZ HEATSOURCE 800 both blueprints have different skin for this optic one has bigger coverage and different placement and other one might be shorter and differently placed too so depending on the sniper rifle the optic skin choice either Violence and Timing or Sequoia will depend either on aesthetics or how it will look and work.
10. Optionally you can turn your secondary which will be pistol into silenced version with camouflage that can be either the same as the sniper rifle or different but will help blend in. (Pistol depends on your choice I personally use Desert Eagle but I might change it to Glock 17 or SIG P220)
Bonus: The way you're going to blend in either inside bushes, prone in grass or even create illusion of you being the prop like small bush or something similar depends on your skills and imagination or just experiment and even in the most obvious spot you might be invisible if you know how to make it work.

My first guide that hopefully it will help somehow if there are any errors or issues or other negatives I deeply apologize my autistic brain can't handle too much stuff and my overall thinking is different but I tried my best to make this guide from my own experience and ghillie versions of all sniper rifles in my own creative way. I hope that this guide will somehow help bring more people into Ghillie Suit Gaming in MWII. If you managed to get to this part I wish you the best and hope for the best sending best vibes and have lots of fun trying out Ghillie Suit Gaming.