It starts by checking your books
A clean start, with evidence.
When you join, it examines your existing books: double entries, missing numbers, balances that do not agree, tax that does not match. You get a list of findings, largest first, each with its evidence and a proposed fix that you approve.
Findings, largest firstEach with its evidence and a proposed fix
01Tax on sales does not match the returns filedEvidence: 14 invoices, 3 returnsFix proposed: correcting entries
02The same supplier bill booked twiceEvidence: 2 entries, 1 paperFix proposed: reverse one entry
03Bank balance does not agree with the booksEvidence: 9 unmatched bank linesFix proposed: match and post
04Missing numbers in the sales invoicesEvidence: 4 numbers never usedFix proposed: ask, then note