Stem bearing, how hard it is to replace?

[Jiggadude]

Hi guys,
Im going to buy a 86 250cc with around 15k for less than $1000 but the owner says it has a loose stem bearing that need to be replaced. I checked on the part and it costs around $30 and im so willing to get my hand dirty. If you guys ever had an exprience about this pls let me know how hard it is before i buy it.
Thanks

[Big_J]

the bearings have to be pressed in, so a machine shop would be the ideal place to get the work done, they ned to be pressed in evenly so it kind of takes the do it yourself out of it.