Budget the government charge for the chosen process, professional preparation, credential evaluation or translation where the listing calls for it, and travel. Check the USCIS fee schedule rather than relying on a figure quoted for another case.
How to sequence the spending
Spend in the order that information arrives. First, pay for a review of whether the duties fit a listing, because nothing else is worth buying if they do not. Second, order only the credential documents that listing requires: a Lévis applicant with a Québec university degree rarely needs a full equivalency report, whereas one relying on a college diploma plus experience may need dated employment letters more than any evaluation.
Third, decide between the port-of-entry application and the I-129 petition, since the government charge differs and so does the professional work involved. Hypothetical example: a Lévis procurement analyst pays for a premium equivalency package before anyone confirms the listing, then discovers the role is being treated as management consultant, which turns on a different qualification. The money was not wasted on fraud, only on the wrong question.
Ask any adviser whether the quote includes handling a follow-up request.