It depends on the pistol, but VERY generally speaking, you clear the gun, take the slide off (the slide removal process depends on what type of pistol), take the guide rod out, take the barrel out, then put cleaning solvent on the parts, let it sit for a little bit, wipe the solvent off, put on a very thin coat of lubricant on most of the metal parts, then put the gun back together.
No
Request a manual from the maker.
dissasemble pistol. check on line sites re: cleaning the 45 cal. pistol
A tendency to jam if not kept clean.
Follow instructions in owner's manual.
You can request a manual from Ruger on their web site.
You can get a manual for free on Browning's web site.
Recommend you ask a gunsmith for assistance.
I have a complete set of photos where you can see how to assembly and disassembly your pistol. If you are interested, send an e-mail to massud@uol.com.br
Follow the instructions provided by the manufacturer.
Best to ask a gunsmith for help.
It wouldn't hurt, but it's not necessary.