Hi @Chipo. Control what you can. Having a port was the best decision for me, as I also have bad veins. It takes one stress out of chemo. Lots of people find it helpful to use a local anaesthetic patch or cream (brand name Emla) for when the port is accessed, but it was never offered to me, and it never bothered me. My port went in on a Friday and was accessed for chemo the following Tuesday - 4days. That was probably the worst one. I would also warn you that the pain from the insertion was, for me, worse than the pain following my wide local excision and axillary clearance. But I am a bit of a wuss.
As @SoldierCrab has said, the list of potential side effects is long, but very few people get all of them, and some lucky people get very few of them. Who knows where you'll fall on the spectrum .
Take care,
Lyn