Look, I apreciate the effort, but it's clear as day you have no experience doing this, so choosing the latest unreleased chapter of a series many people look forward to is not the correct thing to do given your current skills. You're just exposing yourself to get bashed by the community, and I believe it's pretty obvious we don't have, let's say, tolerant and patient readers for cases such as this.
If you wanted to do this, the proper path would have been to go to the first chapter and test the waters there, then little by little get better until you catch up; this way, not only will you avoid others telling you sniped a series, but you also get your much needed practice for the skills necessary to do a scanlation.
Or, you could have taken an abandoned series, or a new one, to get better.
Also, in case you don't understand, because it seems many still do NOT get what sniping entails... scanlations obviously do not require licencing, this means, anyone and everyone can get a series and start doing it for the lulz; but this does NOT mean you or anyone has free reign, because what matters here is the continued releases over time, and if someone for their own selfishness, releases the next chapter of a series that is being scanlated by someone else, what it's going to cause is for the "stable releases" to stop, because not everyone has nerves made of steel, so if they see their project being taken over they will either get annoyed, or at worst they will get sad by this fact and stop.
Basically, this is about psychology and social relationships in the world of scanlations. Sniping will likely lead to either slower releases, series being abandoned, constant bickering between teams, and god knows what else; so, just don't do it. At the very least, ask if the group is still doing this, and if you get no reply, put a disclaimer on the FIRST page clearly stating this, as well as saying if you have or don't have experience, so people can be ready to what they will find.
Or, of course, you could just release the chapter for yourself.