I started with this a few years ago and was just like you. Simple answer is NO. You dont have to speng 5k to shoot accurately at long range. I shoot a TIKKA and a Weatherby S2. One thing I will tell you is there is no substitute for good glass. I have a Vortex Viper PST 6-24x50 ffp, on a TIKKA 300 WSM. That gun is an 800 yard gun all day. My other gun, Weatherby S2 in 243 win. I have a Vortex Viper HSLR 4-16x44 and it's a 600 yard gun. The main thing to doing it is get the stuff and just start doing it. The more you shoot the better you'll get.
I know if you watch these shows they will make you think it cant be done with out their products. Dont buy into that. It can be done. Practise, practise, practise...