If you're using your main account, do not use a proxy. If you've been using the same IP for awhile, then suddenly switch IPs and unlock a bunch of new game avatars, it's going to look like someone else played for you on your account.
If your main and side accounts are legit, you don't need to use a proxy. When I actively played, I would keep my main and one dedicated side to my static IP, then any other account I would associate with a VPN/Proxy connection.
You probably know, but since you're a "newb at cheats/proxies" be sure to get the hang of AoBing before you try on your main, or any account linked to your main. Use your proxy on a side account that you don't use and cheat on there before switching to your main. One mistake can ruin years of work (I'm sure almost everyone here can relate).