Do not guess the fix. Start with what the nail is doing.
Press-on problems become easier when width, curve, contact, adhesive, and daily stress are treated as separate variables. Pick the closest symptom below and follow one path first.
The nail does not fit
Too wide, too narrow, tight, curved, flat, crooked, or rocking before adhesive.
The nail lifts or pops off
The first lift point tells you where to investigate instead of changing everything at once.
Glue or tabs are the problem
Start with fit, then choose adhesive around the exact product directions and your removal goal.
Daily life keeps breaking the set
Water, keyboards, chores, gym work, and long shapes change the stress on the bond.
You want to remove and reuse the set
Removal method, residue, labeling, and storage determine whether the second wear is easy or confusing.
If you are not sure where to begin
Check fit before adhesive.
Width → curve → contact. If those three are stable, move on to prep and adhesive.