Hi! I want to know more about car stereo and buy a new seicane android car radio to install in my 2009 corolla. How to install it? Is it difficult? Hope get some help from here!

Go to google or you tube. There are tutorials for all sorts of automotive repairs and installations. You may not find exactly what you are looking for but you can get the basic idea and go from there.

I'd recommend the Youtube way as well. You will need a special tool, probably $5 from ebay, to remove the head unit. It will probably not function again once removed for security reasons - there may be a code for it in the original factory owners manual to reenable it. If so, write this on the back ASAP in case you sell or reinstall it and need the code.

After that you can get a harness to fit the aftermarket stereo. Again, ebay is good or check out SUpercheap auto. They always have a good range of audio loom conversion kits.

Last, decide on the head unit. If you have a double-DIN slot you can go with either single or double DIN, will just need a spacer for the single DIN type. If you have a single DIN slot obviously you're restricted to single DIN.

Connect it all up and away you go.