Slim to none. It all depends on if it matches the environment though. If it doesyour not gonna be seen by anyone. Just make sure to stay completely still and NEVER move around too much. Make sure you wear a camo face masknot for paintball but one for hunting because a camo paintball mask doesn't look natural at all. Also, dont just fire like crazy, take a few precision shots and never take more than 2 shots in the same location (sniper law) What's best about ghillie suits is that you can disapear in the open. You have to know what your doing thoughif its not a good quality hunting one.dont even bother.
It's not very hard at all, but depending on what type of material you're screwing into, you may need an electric screwdriver.