Full payment will be done only after you have seen a partial preview/demo of your request ( this eliminates doubt concerning scams). The preview will be censored with bars, pixelation and watermarks. It will be done in such a way that you will be able to notice the photo has been nudified.

Payment can be done ANONYMOUSLY through Paypal but only if you upgrade to a business account, this way you’ll be able to change your name. (This is not necessary, a personal type of account is good enough)
Another anonymous method of payment is Bitcoin.
I recommend Transferwise. It has less fees than Paypal. Downside is you have to wait 1 day (processing) and it’s not anonymous.

Also even after you have payed the photos will be tweaked or fixed for free if  you spot something bad with the edit, the PSD files are kept for a few days letting them be reedited easily.

To further prove that this is legit, click this link( you can see that I have a good reputation here if you read the comments), here too you can order my service, the site has buyer protection but higher fees: http://bit.ly/1qwBW9X
You might be asked for 1$ in advance before work gets started and before you are shown the preview, this applies only to some people (this is done in order to avoid false requests, please understand that many people don’t want to buy from the start, so I don’t want to waste my time)