rollingini

i have '90 ls400(a) ....my rear strut is leaking air but if i pick up my rear and help it pump some air it stays untill i turn off till morning.... how hard is it to change air struts on lexus ....is this diy for average joe with good mechanical knowledge or is this mechanics jobs

i found my needed part just wondering if its worth to buy it and do it myself???
ebay listing of air suspension for ls400

thanks