Rear shock rebuild

I recently blew the seal on my ohlins rear shock. Anything special about replacing it. It just looks like I pull a circlip and it pops apart. Then replace said seal, refil proper amount of oil and then take it somewhere to recharge with N2...As long as the shaft isn't totally worn out right?
Am I over simplifying this? I have rebuilt other hydraulic cylinders at work just never a rear shock.

Thanks in Advance
Jason