Treatment Accident damage as a victim

Good evening, I unfortunately had an accident today. The question of guilt has been clarified, the opponent is the culprit (and confirms this too). In a previous accident with an older vehicle I ordered an expert and then fictitiously charged with the insurance and had the vehicle repaired afterwards (partly). Now, however, my damaged vehicle is a only 1 year old, new-value vehicle, which I also like to tiptop again. My question: How do I best handle the whole thing? – Order self-assessment and then commission the contract workshop? Do I then also receive compensation for the impairment of the restored vehicle? Damages may amount to 2-4T€. – Or simply order the contract workshop and this with repair and possibly the processing with the insurance? Or does my contract workshop also commission an expert? – Other variants such as one of the g Egnerische Versicherung proposed workshop of course do not come into question About tips and experiences I would be grateful!