You can definetly change out the battery, its very basic, you take about a 10mm wrench and losen the terminals, then you will have to remove the bracket with maybe a 12 mm socket. Just make sure you have between 10 and 12mm and you should be fine. About the ignition, they got it to work with a screwdriver, see if you can. If not tow it to a garage or the dealer, but have the dealer just just change out the ignition and take it somewhere else for the rest of the work, you will save a lot in the end. Hope it starts. Good luck.