It is not too difficult to hang pictures on the solid walls. You can get small plastic hanges (megamart, Carrefour etc) all have them, they have three small pins in the plastic J shaped piece. You simply decide where you want the picture, hold the J shaped plastic piece up to the wall and hit the pins strait on with a hammer. drive the pins in until they are flush with the plastic and viola, you are ready to hang a pciture on the hook. It takes a little more to drill a hole in the grout, but it too is not diffcult.
If you live in a compound or an apartment, they normaly have a handy man that will do these things for you at a small fee. Tip him diectly and tip him well and he will be very willing to come back to help again.