I applied and was turned down because my eligibility ran out in 2005 and I have nothing to show that I qualified then.

The best way is to get all your documentation, apply online submit your docs and wait for the initial letter. A letter stating your issues can be useful. Here is an example template.

I would hold off on getting a lawyer until at least your first denial letter, if you do get denied. There is really nothing that a lawyer can do in the application stage that you can not and disability lawyers have a huge incentive to drag your case out as long as possible as they get a percentage of back payments. However, it is probably a very good idea to get a lawyer for any appeals.

Be honest, but do not try to minimize how your issues affect you. When I went through the VA disability process I used the worst day in the last three months as well as an average day to use as a basis to answer questions. If you get sent to a medical exam, don't miss it. That will sink you. Of course, do not exaggerate anything or lie.