What kind of tv? For webos it’s potentially a bit complicated but also potentially stupid easy depending on which version of webos your tv has
I would strongly suggest avoiding nvm even if it’s supported unless you’re very comfortable with hardware hacks. The others are all software and fairly easy to do if you’re capable with following instructions. The most recent, dejavuln, is fairly simple but can be a bit finicky (you may have to try a bunch of times) but lg is also rolling out patches for it so if your tv is updated you may be out of luck. It’s hard to say because the patches aren’t rolled out unilaterally. Webos is a bit confusing and there are many “branches” that all have similar features but wildly different numbering. If your tv is patched block updates by either disconnecting from the internet or blocking the above sites in your router and watch the webos homebrew discord (linked on that site). There are people actively researching new exploits and if one pops up it’ll be discussed in the discord first (and if it’s a big deal, like they expect it to be patched, they usually ping everyone to let them know to do it asap)