You don't need to be extremely skilled to get the rewards no. Knowledge in pvp. To get the most rewards you just need to be in the top 100 of the ranking (which will probably count for the mount as well). If you want to understand how Ranking in the feast works...
There are 6 Tiers No Ranking-> Bronze->Silver-> Gold-> Platinum-> Diamond
You start out The Feast as a No Rank,
For every win you gain around 25 Ranking (Can Change depending on the strength of your team and opponents)
For every loss you lose 0 Ranking
When you reach 200 Ranking you advance to Bronze Tier.
For every win you gain around 25 Ranking (Can Change depending on the strength of your team and opponents)
For every loss you lose Ranking, lost ranking at bronze isn't very much it does increase as your overall Tier increases though.
For example right now i'm Plat tier I can lose around 25->30 Ranking in a match and only gain like 19->25 Ranking depending on the match-ups.
As a Bronze you would lose like 5-15 or something (cant remember at the top of my head but it isn't very much)
To get on the top 100 right now in Primal Data Center you would need around 860 Ranking Min, which isn't that hard if the ques are active and you are familiar with how PVP and the feast works.
IMO I would recommend 1 v 1 Duels for a while in order to get used to PVP skills (which are super important in The Feast and any PVP mode) and then practice in 8 v 8 or in 4 v 4 itself.
It's a good idea to read the rules of the mode before hand and maybe watch a few videos to understand the flow of a match (just like how you would watch a PVE video, they really help).
After that its just practice, practice, practice.
