Doing the Ring on a Xbox/PS4/PC may give you the impression you know the circuit but it will lull you into a false sense of security.
I've done around 80 laps of the Ring and I remember where the track goes but I don't 'know' it. My fastest BTG was 8min 10sec in a Zetec engined Phoenix (pre-supercharged) running around 210BHP.
The problem these days is the following...
The Ring on Tourist Days is considered to be a one way public toll road under German law and you are required to have a minimum 3rd party insurance cover. Most, if not all, UK insures explicitly do not cover the Ring so you are driving on a public road without insurance.
If you have an off or cause someone else to have an off they will come after you. You will pay for all the armco you damage (or cause to have damaged), the clean-up, the stoppage on the circuit, the damage to your car and to anything else that was damaged plus any third-party injuries. But you are not insured....
Let's assume you crack the sump of the kit on a kerb and drop oil round the next two or three corners before it seizes and spits you off into the armco. Along comes four Bikers who all total their new Ducati Panigales and one loses a leg (and he is an elite sportsman who can't work anymore), then a new McLaren spins on your oil and takes out more Armco....and so on.
You are liable for all of the damage, clean-up, air ambulance, repairs/replacements and the cost of ruining the elite sportsman's career. Extreme example but dropping oil in the Ring or crashing is likely to cost you minimum in the £000s and the upper limit could cost you everything you own.
By all means go, rent a car from the companies who rent cars for the ring (Several £000 excess) and book a ride in the Ring Taxi but don't take your car out without appreciating the risks to you and your wallet. It is an amazing place but it can and will bite, especially first timers.
There are Trackdays where you are not liable for third party damage but would still have to pay for armco, cleanup, recovery, closure etc so that might be an option if you want to do it.
https://www.youtube.com/watch?v=Qj2uM31ZqR8https://www.youtube.com/watch?v=pqRA34ITi_USpa is closer, doesn't charge you to clean-up and is pretty thrilling to drive.