If unsure about zakat calculation, they should:

1. **Consult Knowledgeable Sources**: Seek guidance from a qualified Islamic scholar or zakat expert.
2. **Use Reliable Resources**: Utilize trusted zakat calculators and guides tailored to complex financial situations.
3. **Document Financial Details**: Keep detailed records of assets and liabilities to accurately assess zakat eligibility.
4. **Ask for Clarification**: Ask for explanations on specific points of confusion to ensure correct calculation.
5. **Pray for Guidance**: Make du’a for Allah’s help in fulfilling the obligation correctly.