Mountain ranges in Sichuan are not super big like Karakoram or Himalayas. They are usually lower and smaller mountains than these two. Base of the mountains in Sichuan are also lower than these two with lowest at below 2000 meter. However, the infrastructure advantage makes these mountains here more accessible by cars than that of Karakoram or Himalayas. At some places you can drive to the base of a mountain or to use a town as your base camp.
The road system in western Sichuan has improved a lot since the last few years and are still renovating. Compare to 10 years ago, you can basically save half of the time on the road now. And many new roads lead to villages and valleys, making approaches by foot shorter.
Gangga Range South
Minya Konka Range West
Genyen Range West
Porters are with different styles. Some places easy and some places difficult. For example at Mt. Siguniang the carrying business is regulated by the local parks so easy to arrange. Approach by foot is normally no more than 3 days anywhere in western Sichuan.
Siguniang Porter
Minya Konka Porter
Route: Chengdu - Mt.Siguniang - Chengdu
Route: Chengdu - Gongga - Chengdu
Route: Chengdu - Gongga - Chengdu