'Now is the time to roll-up our sleeves and get on with it,' Purse told the Echo.
'Nobody is going to change the fixture list or do us any favours - it's up to us.
'We have two massive games in three days over Easter and it's going to be tough.
'But that's what we should expect. This really is the nitty gritty part of the season and we need to stand up and be counted.
'The lads have worked it out and I personally think that we need more than four wins from the remaining six fixtures to be sure of a place.
'I also reckon that while a lot of people have said that we need six points from these two Easter fixtures, four would not be a disaster.
'Whatever happens though, I just have this funny feeling that the campaign will all depend on going to Ipswich for the last game of the season with us needing to win to secure a play-off spot.
'Let's put it this way, if we win the next six games then we will be in the play-offs.
'We at least need to win four and draw two, something like that, but it's our home form that will give us a guide.
'When you consider that we have only lost three games at home this season, that's not bad going.'
Purse hopes to be fit for the weekend double header against Sheffield Wednesday and Burnley.
'I thought I was going to be fit for the Sunderland game, but I had a reaction to some training,' he said.
'It was tight, but I'm pushing to be involved for the weekend but that will be down to the manager.
'That said, I'll be ready and fit.'