Tips on modding gta online

Hello! I've been a long time console player and have just recently bought the game for steam, I'm just wondering a couple of things. Is the cheat engine money hack where you take a car and change the value still a viable way of getting money? If so is it safe providing I don't give myself ridiculous amounts. Also are there any safe hacks to level up your character quickly, just want to hit player level 200 to get all the unlockables associated with player level. Any other tips or tricks are greatly appreciated. May be worth mentioning I'm not planning on joining any online games, this is just for me and my gf in private sessions so we can just fuck about without the money grind.