There are step by step repair manuals put out by a company for nearly every automoble. I have them for all mine but for some reason I forget -----Oh HAYNES MANUALS. There are others to. Look in your auto parts or big box stores.
The GM factory service manuals specific to the car are the best ones to have. I don't know if they have the '88 versions out on CD? You really need the 1988 Buick Electra and LeSabre Estate Wagon service manual and the 1988 General Motors body service manual to cover everything. You can get them cheap on evilbay, Faxon's also has them, first things you should buy after you buy the car, before you buy it is even better. http://www.faxonautoliterature.com/Default.aspx
Haynes and Chilton both make repair manuals - the kind you see on racks in auto parts stores - are available, but I've found that the ones normally in stock at the stores rarely cover older vehicles like ours. We'll probably have to order direct from the publisher.
I've also heard the Haynes manuals have mistakes in them. But they are cheap enough and things like front end photos and repair seem straight forward. Also it does not have to be exactly your year. I used a Monte Carlo Haynes from around 1975 for a lot of things on my 55 Chevy and the 41 Ford with Nova clip. Sometimes these can be picked up at flea markets, yard sales, etc. cheap. Also it does not take rocket science to see bad tie rod ends, ball joints, and drag links worn out. But it does take one to spell science! But I got it!
The Haynes are available at Canadian Tire, the Chilton's are at Walmart. I will check with my brother and see if he still has his manual left over from his 86 Pontiac Parisienne Safari. It would be the same book. He no longer has the wagon, so I may be able to meet you somewhere and pass it along. He's in Orillia, and I'm in Barrie, but I work in Toronto a lot of the time.
As a mechanic, I make a great I.T. guy. I needed more help than the Haynes books provided. The biggest thing for me is that the Haynes manuals are based upon a complete teardown of the car. Because their books are so small, they assume that you already possess a fair amount of automotive knowledge/skill. The factory manuals focus more on diagnostics and provide more detail about how to get a part out. I bought my Roadmaster manuals from Bishko Automobile Literature. He has a good selection of both used reproduction books. The reproductions more money but you know that you're getting the most recent copy with all of the appropriate addendums and corrections. http://www.autobooksbishko.com/search.cgi?year=1988&make=Buick&category=All