In the past I've used paid levelling guides and at the time were well worth the price. Unfortunately, I'm not familiar with any paid levelling guides on the market at the moment so I couldn't offer an informed opinion. As others have mentioned, there is a mod called Carbonite (paid subscription) and it's well worth every cent they are asking for it. To be honest, if they tripled the price I'd still pay for it. Some people have an objection to paying for a mod, but I guess it's the same people who have an objection to paying for a levelling guide.