Work out what you can comfortably afford before you start browsing vans or talking to lenders — the single most useful first step.
Two lenders offering the same APR can leave you very differently placed depending on term length and deposit. Working out a payment you can sustain even in a slower month — especially if you're self-employed — matters more than chasing the lowest advertised rate.
Lenders typically average your income over 1–3 years of accounts or SA302s. If your income varies month to month, budget against your lower months, not your best month. See our guide on van finance for the self-employed.