You will run a HYIP but can't install the script? Maybe you should leave the fingers of it. Has your site a SSL certificate? If not no one will trust your site because all HIYP end in a scam for investors.
If you can't install a simple HYIP script but will run a HYIP on my opinion you will make fast money and scam people with your site.
I've earned $120,000 on "the Internet" running my own sites, 100 plus sites from dating sites to PTC to affiliate lottery sites, most money earned over the last year, and guess what? I don't know how to install a site via FTP or any other method. All I can do is basic back end admin. What have you earned?
Sometime soon I hope to learn so I can save money not hiring people to do it and giving out my cpanel passwords.