I recently ordered my little boys nursery furniture from the IKEA website, I think the only trouble we had was that we could not pay with our debit card (ziraat bank) and had to use a credit card instead. Like most stores, paying with a credit card they give you the option of paying across monthly installments but we dod
not bother with this so can't comment on that.
As for the delivery, all items (4boxes) delivered together within 5days of me ordering (This included a weekend)- you are given a tracking number so you are able to always track the order. We also got a call from the delivery couriers to inform us when delivery would be.
I did not choose to use the place in Ovacik as I was told it would need to be picked up from them whereas Ikea delivered to my door.