Doing an Andras summoning in that manner may work, but isn’t the best idea. He can be a very helpful demon for work like this and a great ally to have, but his energy and presence alone can affect you and your environment negatively if you don’t take precautions.
You would want to first clear your space and banish, then setup shielding and protections to ensure that his energy doesn’t rub off on you, then do your ritual with him (calling him in your preferred way and asking him), give the license to depart and then thoroughly cleanse your energy and space afterwards.
Alternatively, you can just use the pathworking method (from either Carl Spartacus’ or Corwin Hargrove’s respective pathworking books) which would be easier but you’d still want to cleanse before and afterwards just in case.
When you do the actual ritual you want to focus on the feelings of anger, injustice, rage, hatred and similar. You absolutely do not want to focus on any guilt or worry you may have related to the working itself, just focus on your feelings towards the person. Feel it build up in alignment with your ritual and as you finish off your ritual let it all release outward. You can pair this with a visualisation of the outcome you want on your target.
You can do this anywhere but as mentioned if you do it in your house or something you will want to cleanse afterwards. Doing it outside in nature is a good choice because you can automatically ground right after and the trees would clear away any lingering negative energy from the ritual.
The being you choose would depend on the type of outcome you want to inflict upon the target. You could use Naberius to destroy their reputation, Haures to make them unlucky and fail in their endeavours, Glasya-Labolas to cause serious physical illness and mental anguish, and the list goes on endlessly. It really just depends on how you want to affect your target, learning them and knowing what would be most painful is how to do a truly effective revenge curse.
You could of course do a general curse and get good results, but probing more into your target (through remote viewing, divination, and other means and any information you already know about them) and hitting them in what they think are core aspects of themselves is far more effective.
An example is you might have a target who prides themselves on their body, maybe they’re an athlete or gymgoer and it’s a big part of their personality: you could do a general curse to make them unlucky and suffer and whatever else, or you could do a targeted curse to make them get injured, to make them develop body dysmorphia, to make them physically weaker and repulsive, to make them ill in a way that messes up their body, etc. The second way of cursing would last far longer and have a much more brutal effect since it’s self-sustaining, from the moment the curse is completed their own insecurity and ego begins to feed it too. It becomes a constant state for them and their psyche begins to feed into their misfortune much more, it can’t be easily brushed off, and that will perpetuate the cycle more and make it develop more and more over time.
Of course, in general you’d have to decide if the target is worth the effort. Most of the time I’ve ended up not doing curses as the answer wasn’t a hard yes, but in your case it sounds like the answer is yes.