Elements are dead easy. When I did ours (also Neff), it cost about twelve quid for a reasonable-looking compatible part (the genuine Neff one was quite spendy), and changing it involved something like eight screws.
(ETA £8.95, not twelve quid ... Search using the oven's model code - for mine, 9 characters, on a label inside the oven door. On a sample of one, I'd recommend ebay seller
kd102000 - cheap, good service, and the part has worked fine for two and a half years so far.)