moonsail,
If you have a pretty strong grip you can get the center one out easily. Take two main cap bolts and insert them in the holes of the cap, but only down to about where the threads begin on the shank. Now grasp them with your stronger hand and squeeze them together while rocking the cap fore and aft and hauling upward. Just a little at first, and then as the cap starts to move, more rocking. BE CAREFUL! Now is when it'll come loose suddenly. Before I had a decent lightweight slidehammer, I did it this way for years. The rear is more difficult.
The rear cap has a lot more contact with the block, and therefore a lot more friction. Rocking this cap is almost out of the question. We have actually built a little puller for this job here in the shop, but once again, I remember doing this before that puller. You need three hands, but it works.
Insert a bolt in the central hole in the cap. The longer this bolt is, the better. Now, insert screws in the oil sump screw holes near the edges of the cap. Place a couple of small stout wooden blocks outboard of the cap and use a pair of large screwdrivers under the heads of the sump screws to pry the cap upward evenly. Use the big bolt to keep the cap moving vertically, as it will want to wander off kilter and strike the crankshaft. This may all sound quite eloborate, but it is vitally important not to distort the caps or use anything to pry against their working surfaces, including those surfaces which bear against the block in any position or manner. Enjoy the process.
Motorbill
From Lola to Land Rover, If it's British and has wheels, it's likely I've bloodied me knuckles thereupon