The deadline is jurisdictional
The clock starts on service of the order or judgment with written notice of entry. Missing the deadline to file the notice of appeal generally ends the appeal permanently, regardless of the merits. If you think you may appeal, file the notice — it is inexpensive and preserves the option while you evaluate.
Building the record
Perfecting an appeal means assembling the record or appendix, ordering transcripts, and filing a brief within the court's timetable. Transcripts take time and cost money; order them early. The Second Department has detailed rules on format, content and timing, and non-compliant filings get rejected or dismissed.
Stays and enforcement
Filing an appeal does not automatically stop a judgment creditor in every situation. Certain appeals produce an automatic stay; others require posting an undertaking or seeking a discretionary stay. If enforcement is imminent, address the stay before, not after, an account is restrained.
Realistic expectations
Appellate courts affirm most of what they review. The strongest appeals involve a clear legal error — a misapplied standard, a decision on a defective record, a dismissal that ignored a pleaded cause of action — rather than disagreement with how a judge weighed evidence. Evaluate honestly before committing to the cost.