Although the Lions have gone unbeaten in April, they go into Saturday's curtain-closer at home to Bournemouth in 20th place needing a win to ensure survival.
Anything less that that will allow Birmingham City and Doncaster Rovers to overtake them.
Speaking to the club website, Forde said: "I feel very confident that we can do it, whereas last year we were struggling for form and getting over the line was proving incredibly difficult.
"Thankfully we have found some form with the seven-game unbeaten run this time around, but that won't count for anything unless we can finish job."
Forde, 34, is the Republic of Ireland's number one and has started 39 of Millwall's 45 league games this season.