Alty have surprised the non-League world by taking 10 points from their first four games to lie joint-second with title favourites Luton, trailing leaders Oxford only on goal difference.
They passed their first big test in defeating last season's beaten play-off semi-finalists Histon on Tuesday, but now comes an arguably even tougher examination against a Dons outfit tipped to stake an immediate claim for promotion to League Two.
Heathcote said: "We're obviously delighted to be where we are, but no-one in our dressing room is getting carried away and we're all aware of the stern challenge we're likely to face against Wimbledon.
"It's vital we stay focused, try to keep performing as we have been doing, then let's see if we're good enough to overcome what looks a very strong Wimbledon side."
His selection options are likely to be boosted by the return of young utility player Danny Heffernan, who appears to have recovered from the head injury which forced him to sit out the win over Histon.
Veteran striker Colin Little, so far confined to a place on the bench due to a niggling back problem, is also rapidly approaching full fitness.
Meanwhile, surprise early Blue Square North high-fliers Hyde United visit Ilkeston, where they'll seek to extend their unbeaten start to five.
Droylsden, fresh from thrashing Northwich Victoria in midweek, go to Gloucester in a game put back to Sunday (3pm), while previously unbeaten Vics aim to recover from their 5-1 Butcher's Arms hiding by seeing off visiting Redditch.
Struggling Stalybridge will attempt to end a run of three successive defeats when they take on Workington at Bower Fold.
FC United, pointless after two games in the UniBond premier division, are away to newly-promoted Retford at Lincoln United's ground.
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