Neither of my girls were overly handlable when I got them, particularly not Indi, but over time (about a year) they got progressively better. I think the main things that made a difference was making sure they were ideally positioned to lift them - facing towards you, not awkwardly bending around something or being dragged out of a hidey hole etc - and doing lots of very short handlings with benefits at the end - mine were mainly into the run (benefit = grass & exercise) and out of the run (benefit = dinner!) so that it creates positive associations. As they got better I would pause part way there just to give them a few seconds stroke before carrying on, and this got longer and longer so that they can be held for a few minutes now without struggling. Also very important to put them down correctly - facing towards you and held firmly until all 4 feet are on the ground, so they they can't panic and struggle, which creates negative associations and risks injury.
As others have said, I think its important to be able to reasonably handle a bun if they become ill, and if you only do it for vets and nail trims they always think being handled leads to bad things happening.
Feeding out of your hands, stroking them while they are eating etc also creates good associations with your hands being around them and on them too.