An example of what a confessor might direct a person with scruples about confession:
He might tell them:
Do not confess any doubtful mortal sins -only those that are* certain*.
Do not confess any past mortal sins that come to mind unless 1. It is* certain* that it was mortal and 2. It is certain that it was not confessed already is it ought (number and kind…). Only in a case where both are certain are to you confess it…
Or he might in some cases need to tell them not to ever confess anything from the past (since their last confession only) due to their particular confessional scruples…
Or he might even in some cases have them restrict their confession even more generally…
Again these are examples of what confessor might tell a penitent who scruples in the area of confession - one should discuss with ones regular confessor. A confessor will know their penitent and can direct them.
Those with scruples - discuss with your confessor what to do in your case.
(those with scruples can as I noted be in a different boat then those without such…or even in a different boat than others with scruples…and of course those without that struggle would not be in their particular boat and would not follow many of the things that might be given to those with scruples)
See my post above regarding scruples in general and the importance to have a regular confessor. That is key.