Ansoo Lake and Dudipat Sar won't be easily accessible by end of May and may involve serious snow trekking/hiking for prolonged hours and snow camping as well.
Besides, both lakes are usually frozen till end of June and Babusar pass would be closed so u cannot cross it for onwards journey to Fairy Meadows.
You can go to Fairy Meadows and only way at the moment is through KKH.
Take motorway till Burhan interchange on M-1 and then go to Hasanabdal, Abbottabad, Mansehra. This journey may take 6-7 hours.
From Mansehra, follow KKH N-35 which will pass through Shinkiari, Batgram, Chattar Plains, Thakot, Besham, Pattan, Dasu, Sazin and then finally Chillas which can be your night stay area. This part may take 11-14 hours depending on road condition.
Start again early morning and reach Raikot Bridge in 2 hours. There is an old Shangrilla Hotel which is not operational.
Park your rides there and hire jeeps for Fairy Meadows which take around 1 hour till Tatu village and then a hike of 2:30 hrs to 3 hrs till Fairy Meadows.