Separate, tab and label the different sections of the chart!
One big section, with sub-tabs, for each hospital admission, one for each doctor's office. 
Put everything in three-ring binders.
Send everything your expert needs to give you a solid opinion. Nurses notes can be a treasure trove.
Don't pay to have a surgery-gone-bad reviewed until you can send the operative-report.
Send a list of the records you put in the package.
Send a copy of your copy the records.
Summarize the facts in the case; help your expert get up to speed quickly.
If your client's version of the facts differs materially from the chart's, be sure the reviewing doctor knows your client's version of the facts.
Consider asking your expert specific questions you need answered. "Did cutting the bile duct fall below the standard of care?" "Was Mrs. A adequately informed of the risks of the surgery?"
 Read the autopsy yourself. Don't sink thousands of dollars in a wrongful-death-by-heart-attack case only to have your expert point out that page one of the autopsy report also shows widely metastatic cancer and a six month expected survival. It happens.
 Beat back your urge to date order the chart as a whole. Date order is how you've been trained to think, it is not how doctors think.