Bricks, Masonry, Asphalt and Concrete - need to eliminate a well room

I have an old well room off the basement of my house that I want to close off (it leaks each spring, and I want to landscape over the top of it anyway). My basement foundation is concrete blocks, and there is a hole (about 4x4 feet) in the middle of the wall. I'm not entirely sure how I should go about this project, as I havent has much masonry experience. Should I take it on, or leave this one to a pro?

If I do it myself, I need some basic tips. I would be installing the new block and letting it cure completely before filling in the hole, but should I treat the outside with anything in particular?

If I should hire it out, how much would it cost? (just the masonry part - I will do the filling in myself)

If you have a hole in the masonry wall, you can simply fill it in with concrete block or brick. You will need to remove any wooden structure prior to installng the masonry. Depending upon the depth of the fill, the wall may need to be reinforced.

The best way to figure a price would be have a mason give an estimate. Prices for this work vary a lot.

I would recommend that this infill be reinforced and toothed into the exixting masonry wall...Since it will be expected to resist the lateral force of the backfill it is a shear wall...I would also recommend applying a trowel grade asphalt base waterproofing on the exterior prior to backfilling which you can easily apply yourself Check out this link http://www.karnakcorp.com/pro_wp.html ...My best guess is that hiring a mason to do the block work would cost well under a thousand dollars.